eChapters

Body Segmentation

In general, insect body is divided in to a series of segments, which in primitive arthropods are known as “somites” or “metameres”. During the process of evolution, these somites gets fused with each other in different ways forming the body parts of the existing arthropods. The type of arrangement of these body segments in embryonic stage is known as primary segmentation while in adult insects is known as the secondary segmentation which differ from primary in having a sclerotized membranous intersegmental region.

In adult and nymphal insects, and hexapods in general, one of the most striking external features is the amalgamation of segments into functional units. This process of tagmosis has given rise to the familiar tagmata (regions) of head, thorax, and abdomen. In this process the 20 original segments have been divided into an embryologically detectable six-segmented head, three-segmented thorax, and 11-segmented abdomen (plus primitively the telson), although varying degrees of fusion mean that the full complement is never visible.

Types of body segmentation.

(a) Primary segmentation, as seen in soft-bodied larvae of some insects. (b) Simple secondary segmentation. (c) More derived secondary segmentation. (d) Longitudinal section of dorsum of the thorax of winged insects, in which the acrotergites of the second and third segments have enlarged to become the postnota. (After Snodgrass 1935)

In any organism and biomolecules (enzyme, proteins, etc.), most biological activities could be seen only within a narrow environmental conditions. Therefore in order to carry out a successful experiment, from cell culturing to DNA sequencing or assessing an enzyme’s activity, one has to pay utmost attention in calculating correct reaction components.

A solution is defined as a homogenous mixture of solute and solvent. In this case the amount solute is less as compared to the solvent. It is not always necessary that solvent is liquid and solute is solid. There are several examples where solute and solvents are found in other physical states such as gas or solids. For example, carbonated water CO₂ is solute and water is solvent; and smoke is solution of different smoke particles (solute) in air (solvent). The concentration of solution is described as amount of solute in a given volume of solvent. Several ways are there to express the concentration of a solution, such as molarity, normality, molality, and ppm. In this chapter we would discuss the general terms used in making solutions and a brief introduction about buffer solutions.

Class: Insecta

It is the biggest class in animal kingdom. About 70% of species of animals are included in class insecta.

General Morphological Characters

1. All the character of arthropoda are also present in this class.

2. Body is divided into three tagmas i.e. head, thorax and abdomen.

Normally body of arthropods consists of twenty segments. Head region is formed by the fusion of 1st six segments. Thorax is formed by next three segments and abdomen formed by last 11 segments.

Modification of six pair of appendages of head: 1st pair of appendages is modified into eyes. 2nd pair is modified into antennae. 3rd pair is lost. 4th pair of appendages is modified into mandible. 5th pair modified into first maxillae and 6th pair modified into 2nd maxillae means mouth part is nothing but modification of 4th, 5th and 6th pair of appendages. On abdomen, appendages or legs are lost.

Morphology of head region of insects

Highest point of head known as “Vertex”. Anterior portion sloping in forward direction known as “Frons”. Posterior portion sloping towards thorax is “Occiput”. On the medial aspect of head, there is a pair of compound eyes. Each compound eye is made of number of lenses called as “facet”. Compound eyes may meet one another in mid line (holoptic) or are wide apart (dichoptic). Just medial to compound eyes, there is a pair of non-functioning simple eyes known as “ocellus.” Just in front of these two eyes on either side, there is a pair of antennae. Antennae are made up of three parts, base, pedicle and f ilaments. Pedicle is non segment basal piece. On these antennae, hair may be present. At the base of each antenna, there is olfactory pin. Lateral part of head is known as “Gena”. Just below the frons, there is a chitinous plate known as “Clypeus”. Below clypeus, there is mouth part. Mouth parts are located on ventral side. Mouth part consists of labrum which forms the upper boundary of mouth and labium which forms the lower lip or lower boundary of mouth. On underneath the labrum, there is membranous structure called epipharynx which bears the organ of taste. On upper surface of labium, there is another membranous structure called hypopharynx which bears the opening of salivary duct. Between labrum and labium there is one pair of mandibles and one pair of maxillae. Mouth parts are collectively known as “Proboscis”.

While describing fish, we need complete general information about the different specimens of fish included in the particular class or grade. A flow sheet of the general characters used in this concern may be tabulated as:

1. Origin of the term: The term Pisces comes from the old version of the plural of the Latin word piscis or singular word piscus meaning “fish.”

2. Literal meaning and definition: It describes either the creature or the meat from the creature. It is a streamlined, cold-blooded aquatic vertebrate with scales and gills,

3. Origin and evolution: The first fish appeared around 530 million years ago during the Cambrian period and then underwent a long period of evolution so that, today, they are by far the most diverse group of vertebrates. The Devonian Period is known as the “Age of Fishes”.

1. Genus - Pythium (Type species - Pythium aphanidermatum)

‘Pythium’ is a large genus comprising of more than 200 species. Species of Pythium are either terrestrial or aquatic. They are found world wide and most of them are plant pathogens on many economically important cultivated crops, as well as wild plants. They are facultative saprophytes and can live saprophytically in the soil and plant debris for indefinite periods in the absence of suitable hosts. Pre-emergence and post-emergence damping off of seedlings of numerous angiospermic plants, root rot, rhizome rot and fruit rot are the most common diseases caused by species of Pythium.

Pythium debaryanum, Pythium aphanidermatum, Pythium myriotylum, Pythium indicum, Pythium vexans and Pythium graminicolum are some of the most important plant pathogens, that cause damping off, seed decay, soft rots and root rots of many economically important crops, such as chillies, eggplant, tobacco, tomato, castor, potato, ginger etc.

Life cycle of Pythium

The mycelium of the fungi consists of slender, hyaline, coenocytic hyphae. The hyphae grow both inter- and intra-cellularly. No haustoria are produced.

The general circulation of the atmosphere explains the formation of pressure belts and wind systems in the earth’s atmosphere. It is known that the earth receives more solar radiation near the equator and gets heated more. Consequently, the air gets heated more and rises vertically upwards. As there is more convection of the air near the equator, the atmospheric pressure will be less. The warm air which moves upwards up to a height about 14 km near the equator gets cooled and move towards the poles.

The upper air gets gradually cooled when it reaches a latitude of 30°N in the northern hemisphere and 30°S in the southern hemisphere. At about 30°latitude the cold air descends to the earth’s surface. Some of the cold air after descending to earth’s surface moves towards the equator. The circulation of air between the equator and 30°N or 30°S latitudes is called Hadley cells (Fig. 8.1).

The winds blowing from 30° latitude towards the equator at surface level are called trade winds. These trade winds which move towards the equator in both northern hemisphere and southern hemisphere converge near the equator and the zone of the convergence of these winds is called Inter Tropical Zone of Convergence. As the convergence of air takes place, due to convection of heat as a result of high temperatures leads to vertical lifting of moist air. Therefore, the Equatorial regions receive more rainfall and there are tropical forests in this region.

Introduction

A thoroughly performed physical examination in poultry and avian clinical practice is of great importance. Most avian species happen to be prey animals, with the exception of a few raptors that tend to be predatory. This makes them try to appear healthy, in preparation to escape from potential predators, and as such, makes it difficult for their owners, keepers and veterinarians to detect early diseases. Physical examination when carefully performed in detail, increases the chances of obtaining fewer differential diagnosis that are likely to be harboring the confirmatory diagnosis after laboratory works are being performed. In essence, a thorough physical examination brings about cost efficiency in poultry/ avian clinical practice. Take for instance, a farm with over 50,000 layers, having lowered productivity. It will be cumbersome to go ahead and start blood sampling, faecal sampling or oral cavity swabs for laboratory analysis as the starting point. The disadvantages will be high labour demands, high capital demands, more stress on the animals and of course, long time till feasible outcome is to be obtained.

Structure of matter: every structure is made up of elements. Elements can join together to make compounds. The smallest particle of a compound is a molecule. The periodic table gives details of all elements.

Nucleus: the center of atom containing protons and neutrons and hence almost whole mass of the atom. 

Atom: the smallest units of matter composed of electrons are negatively charged, protons have a positive charged and neutrons are neutral. If there are more electrons atom will be negatively charged, if there are more protons it will be positively charged. The total charge of electrons is equal to protons and hence the atom is electrically neutral.

Analytical Reagents

Chemical reagents are supplied in different grades and each grade has a distinct purpose and range of uses. The purest grade is analytical reagent (AR), the second is laboratory reagent (LR), the third is guaranteed reagent (GR) and fourth is technical grade. Second and third form of reagents have a lot of impurities. Therefore, for the determination of micronutrients, AR grade reagents should be used.

Distilled Water

Distilled water is always used in chemical analysis. The quality of distilled water varies from single distilled water to double or triple distilled water depending upon the requirement of analytical technique(s) e.g. double distilled water (glass distilled) is always recommended for micro nutrient and heavy metal analysis.

All control measures are directed to bring down the nematode population low enough to raise the crop successfully and profitably. The choice of control measures to be taken depends upon the nematode species to be tackled and the crops involved.

1. Cultural methods 
The objective of these methods is to adopt suitable land management practices, so as to bring down the nematode population in the field to a low level, which may not cause economic injury to the crop or to keep the field free from parasitic nematodes by adopting suitable preventive measures. Besides causing direct damage to the crops, several nematode species are known to transmit many fungal, bacterial and viral pathogens, which aggravate the extent of damage caused to the crops. Many of these pathogens gain access to the host plants only through mechanical injury caused by the nematodes. By controlling the nematode parasites, the incidence of diseases caused by such phytopathogens can also be avoided to a large extent. Cultural methods, though may not give spectacular results within a short span of time of a single season or year, as in the case of chemical control measures, if followed over a number of years is sure to give encouraging results. Cultural methods include crop rotation, fallowing, ploughing, flooding, trap cropping, use of organic amendments, selection of seeds and seed materials, use of resistant and tolerant varieties etc.

Dairy animals are the backbone of animal husbandry. India is the largest milk producer and ranks first in the world with a share of 25% of global milk production. Haemoprotozoan diseases pose significant limitations to the health and production of cattle. It leads to significant losses in the livestock industry worldwide. However, most protozoan parasites in the blood are known tocause anaemia by inducing erythro-phagocytosis. In terms of  mortality, reduced milk production and reduced immunity power, hemoprotozoan parasites pose a major threat to the livestock population. Theileria, Babesia, Anaplasma and Trypanosoma are the most important hemoprotozoan diseases of veterinary importance. These diseases affect different livestock species, caused by different species of Trypanosoma, Theileria, Babesia and Anaplasma. Tick-borne hemoprotozoan infections have a significant negative impact on the health and productivity of cattle and result in major losses to the global livestock industry. In tropical and subtropical regions, tick-borne hemoprotozoan infections have a significant impact on animal production. In India, these hemoprotozoan parasites have long posed a serious threat to the survival of exotic and crossbred cattle (Ananda et al., 2009). Haemoprotozoan diseases have deleterious impact on health and production of animals causing death in acute cases, production losses in chronically affected animals which decrease economic share of livestock sector (Bharti et al., 2022)

In most of the underdeveloped and developing countries, regional diets are monotonous, unbalanced and poor in quality having a high percentage of starchy components and inadequate proportion of protein. The long-term solution to the problem of protein malnutrition lies in the greater production and better distribution of a protein-rich diet. Fish offers protein in a cheap and alternative form. Probably due to this, man has exploited the hydrosphere for food and consequently the history of the development of pisciculture. As the fish perishes rapidly, methods have been devised to keep the fish fresh between the catch and consumption.

The development of fisheries in India has attained considerable progress in increasing the per hectare yield of carps by controlled breeding and rearing of the young ones. Keeping the pace of development, the culture of air-breathing fishes has attracted the attention of aqua-culturists. Many varieties of these fishes have been successfully bred using pituitary extract (Ramaswami and Sundararaj, 1957; Moitra et al, 1979; Thakur, 1976). The traditional methods of transport of spawn, fry, fingerlings and even brooders in various open and closed systems pose major problems due to their heavy mortality. The mortality of live fishes is high mostly due to stress during transportation. For a long, studies on different aspects of transportation of carps and their allies have been carried out by fishery scientists. Some of the works which need special mention are that of Khan (1939, 1946), Ganapati and Chako (1951), Ranade and Kewalramani (1956), Saha and Chowdhury (1956), Saha et al, (1956a and b), Ramchandran (1969), Singh (1977), Selvaraj et al, (1981) and Jha (1995) etc. In comparison to Indian major carps, consumption of air-breathing fish is not so popular although they are a rich source of protein. However, their demand is gradually increasing. Much has to be done to meet the increasing demand of air-breathing fishes to exploit the maximum available derelict water.

The two commercially important Indian air-breathing fishes, Anabas testudineus (Bloch) and Channa punctatus (Bloch) commonly known as climbing perch and snake-headed murrel belong to the order Perciformes and Channiformes respectively. They live in different trophic zones of swamps and derelict ponds and are highly predatory habits. In the present work, oxygen uptake has been observed in Anabas testudineus and Channa punctatus concerning their body weight and group size. The effect of anaesthetic on the oxygen uptake and the effect of ammonia on the structure and function of the gills in Channa punctatus have also been studied. The findings have been used to evaluate suitable methods for long-distance transportation of these fishes. As we surviving in the COVID-19 pandemic, proper sanitization of all the equipment and accessories is one of the essential steps for fish transportation.

The term ecology was first of all proposed by zoologist H. Pietir in 1865. It was derived from the Greek word ecologic means oikos = living place and logos = study and some definitions of ecology presented below:

1. According to Ernst Haeckel, 1869 “The total relations of the animal to both its organic and inorganic environment is called as ecology”.
2. E. Warming 1895 “Ecology is the study of animals and plants in relation to their environment”.
3. According to Odum 1963 “Study of structures and functions of nature is defined as ecology”.
4. Krebs 1985 says that the “Ecology is the scientific study of interaction that determine the distribution and abundance of organisms”.

The life of insects is dependent on the adaptability of the environment, if the environment is unfavourable then the insect population ceases and vice-versa. This insect move one place to another to get the favourable environment so that they can pull on their life activities properly. There is a deep relationship between the living community and non-living environment. Both are affecting each other greatly. This inter-relationship between living community and non-living environment is called as ecosystem. The term ecosystem was first used by A.G. Tansley as early as 1935 and he defined, “Ecosystem is the system of resulting from the interaction of all the living and non-living factors of the environment”.

1.1 Historical background of the Embryology

Embryology is a branch of Anatomy. It is the study of growth and differentiation undergone by an organism in the course of its development from a single fertilized egg cell into a highly complex and independent living being like its parents. It explains how one develops before he is born. Important changes also take place after birth and continue to occur even to adult stage. eg: Replacement of RbC and WbC is a continuous developmental process and reverting to activities seen in prenatal condition is seen in healing of wounds. So the term ‘Developmental Anatomy’ which includes prenatal and postnatal development is preferred over term embryology as Developmental Anatomy, includes prenatal and postnatal development and as the term embryology refers truly prenatal (Intra uterine) development.

Aristotle (384-332/322 BC) proposed two theories regarding origin of life

Q. 1 Choose the most appropriate word from the options given below to complete the following sentence:
His rather casual remarks on politics ………. his lack of seriousness about the subject.
(A) Masked        (B) Belied
(C) Betrayed       (D) Suppressed

Plant oils are obtained from their plant hosts through a variety of processes commonly called Extraction process. Essential oils are extracted from different parts of the plants. The quality and quantity of the oil is mainly depends on the method of extraction and the quantity of the raw materials used. For example, Lavender is extracted from its flowers, Orange from the rind of its fruit, Frankincense from the resin of its tree, Cinnamon from its bark, Pine from its needles, clove from flower buds and so on. Production of a good quality essential oil, the cultivation factors also play a vital role like soil quality, climatic and geographic conditions etc. As example, Jasmine flowers must be picked by hand at dawn on the very first day they open. A Sandalwood tree must be 30 years old and 30 feet high before it is ready to produce its best quality oil. Further the quantity of the plant materials are also matters for the price and quality of the essential oil. As an example, it takes roughly 12,000 Rose blossoms to produce 5 ml of Rose. Whereas it take 100 kilos of Lavender leaves to produce 3 liters of Lavender. As a result Rose is roughly 24 times more expensive than Lavender.

Livestock plays a pivotal role in sustaining the livelihood of millions of people worldwide, particularly in rural and semi-urban communities. Beyond providing food products such as milk, meat and eggs, livestock also contribute to income generation, draught power, manure for agriculture and socio-cultural functions in many regions. The health and productive performance of livestock animals are central to achieving the economic, nutritional and ecological goals of animal husbandry. Any compromise in animal health or productivity directly impacts farmers’ income, food security, and national agricultural output. Animal health is the foundation of productive and sustainable livestock farming. Good health ensures animals can grow, reproduce and perform at their genetic potential. Conversely, disease, poor nutrition and environmental stress can severely reduce productivity and increase mortality. Common health challenges in livestock include infectious diseases (bacterial, viral, and parasitic), metabolic disorders and management- related stress conditions. Moreover, zoonotic diseases—those transmissible to humans— are of growing concern in the context of public health and food

Horticulture word derived from Latin word: Hortus meaning ‘Garden’ and cultura means ‘cultivation’.

Father of horticulture: Thomas Andrew Knight, John Lindley, Liberty Hyde Bailey.

1^st artificial hybridization in fruit crop in world: T. A. Knight.

Father of vegetables: L. H. Bailey.

1^st book in horticulture: Fruit growing in India: W.B. Hayes (1945) & related to litchi.

Export growth of fresh fruits and vegetables in term of value is 14% and of processed fruits and vegetables is 16.27%.

Contribution of horticulture sector to agriculture GDP (2013-14): 29%.

India is largest producer of Coconut, Cashew, Tea and Spices.

Definition of farmer (National Policy for Farmers, 2001): A person actively engaged in the economic and/or livelihood activity of growing crops and producing other primary agricultural commodities and will include all agriculture operational holders, cultivators, agriculture labourers, share croppers, tenants, poultry and livestock rearers, fishers, beekeepers, gardeners, pastoralists, non-corporate planters and planting labours, as well as persons engaged in various farming related occupations such as sericulture, vermiculture, and agroforestry. It also includes tribal families/ persons engaged in shifting cultivation and in the collection, use and sale of minor and non-timber forest produce.

2.1. What is Greenhouse Technology?

Greenhouse technology involves primarily the structural design that can take care of climate control mechanisms to create proper micro-crop-climate and secondarily it involves the technology needed for optimum growth and production of crop grown under this structure. Combination of these two aspects may be expressed as ‘greenhouse technology’.

So the ‘greenhouse technology’ may be defined as “The technology required to built a structure, covered fully, partly or porously for manipulating the inside climatic conditions, under which crops/plants can be grown with special measures”.

Introduction Identification of animals is must as a requirement in the daily management to spot and identify a particular animal in a herd/group/flock. Objectives of Identification • Identification is done to carry out routine work efficiently. • For registration and recording of the parentage in breeding programme / birth • Identification required at time of transportation and Insurance and loan from Bank. • For individual feeding of animals. • During milking • During sale, for participation of animals in the rally, show and exhibition. • For treating the animal, heat detection etc. • It is necessary for in case of theft and loss of animal for complain and search of animal. Selection of Identification Method • Depends very much on Need and personal

Introduction
Project title:
Objective (S):

1. Proteins in solution absorb ultraviolet light with absorbance maxima at 280 and 200 nm. Amino acids with aromatic rings are the primary reason for the absorbance peak at 280 nm. Peptide bonds are primarily responsible for the peak at 200 nm.
2. Aromatic amino acids tyrosine and tryptophan give proteins their characteristic ultraviolet (UV) absorption at 280 nm, which is routinely used to estimate protein concentration. Phenylalanine and disulfide bonds also contribute to absorption at 280 nm, albeit slightly.

1.1. Introduction

The significance of milk as the most wholesome single food available in nature has never been debated. It is as ancient as mankind itself, as it is the substance created to feed the mammalian infant. All species of mammals, from the lowly rat to the mighty whale, produce milk for this purpose. Several centuries ago, perhaps as early as 6000-8000 BC, ancient man learned to domesticate species of animals for obtaining their milk for consumption. These included cows, buffalos, sheep, goats and camels, all of which are still used in various parts of the world for the production of milk for human use (Fig. 1.1 & 1.2).

Physiological plant disorder is caused by non-pathological conditions such as poor light, weather damage, waterlogging or lack of nutrients affect the operation of the system caused. Physiological condition selected from diseases caused by plant pathogens such as viruses or fungi to distinguish. Although the physiological disorder symptoms may occur such as disease, they can often be prevented by changes in environmental conditions. However, once the nutritional deficiencies of plants showing symptoms, is likely to return that season yield will be reduced.

Introduction India’s animal husbandry sector plays a vital role in the country’s economy and food security. It provides livelihood to millions of people, contributes significantly to the agricultural gross domestic product (GDP), and meets the nutritional needs of the population. The sector encompasses various aspects of livestock production, including dairy farming, poultry farming, sheep rearing, goat rearing, and piggery. Milk Production India is the world’s largest milk producer, with an annual production of 230.58 million tonnes in 2022-23. This represents an impressive growth rate of 3.83% over the previous year. The top five milk-producing states are Uttar Pradesh, Rajasthan, Madhya Pradesh, Gujarat, and Andhra Pradesh. Egg Production India is also the third-largest egg producer in the world, with an annual production of 138.38 billion eggs in 2022-23. Egg production has grown by 6.77% in the last year. The top five egg-producing states are Andhra Pradesh, Tamil Nadu, Telangana, West Bengal, and Karnataka. Meat Production India’s meat production in 2022-23 was 9.77 million tonnes, with an annual growth rate of 5.13%. The top five meat-producing states are Maharashtra, Uttar Pradesh, West Bengal,

Introduction
Clinical physiology is the branch of medical science that focuses on understanding the functional processes within the body under both normal and disease conditions. It emphasizes how body systems respond to disease, injury, and therapeutic interventions, and, forms the foundation of many diagnostic and therapeutic practices in veterinary medicine.
Importance and scope of Clinical Physiology in Veterinary Medicine: Clinical physiology is indispensable and plays a pivotal role in veterinary medicine. The knowledge allows for early detection of diseases, select effective treatment plans, and improved outcomes for animal patients. It is used to monitor the effects of treatment interventions, adjusting medications or therapies based on the physiological responses observed in the patient. A solid understanding of cardiovascular physiology is essential to manage heart failure condition in dog, and, treating respiratory diseases in cats or gastrointestinal
disorders in horses, relies on the knowledge of respiratory and digestive physiology. Beyond treatment, clinical physiology also plays a significant role in preventive medicine. Knowing the normal range of heart rates, blood pressure, and respiratory rates in different species allows veterinarians to quickly assess whether an animal is in distress or experiencing a pathological condition, and allow for timely intervention. It is also critical in managing the health of populations of animals, such as in livestock farming, where maintaining optimal physiological function is essential for productivity and welfare. The major systems in the body - including the cardiovascular, respiratory, digestive, nervous, endocrine, renal, musculoskeletal, reproductive, and immune systems, can be affected by a variety of diseases, and clinical physiology provides the framework for understanding these effects. It encompasses the study of physiological processes across a wide range of species, including companion animals, livestock, wildlife, and exotic animals.

Protozoa are considered as unicellular eukaryotic organisms and evolved after bacteria and thousands years early to multi-cellular organisms as well as animals. This unicellular eukaryotic organism contains all the organelles or structures like multi-cellular organisms but in single cells. Similar to multicellular, the genetic information of protozoa is also stored in chromosomes. The protozoa differ from bacteria in different manners. The differentiating features of bacteria and protozoa are given in Table 1.
1. General Structures of Protozoa
Protozoa, like other eukaryotic cells, contain a nucleus, endoplasmic reticulum, mitochondria, Golgi apparatus, and lysosomes. Beyond these common organelles, protozoa feature a range of unique structures with specific functions that enable them to operate independently. Protozoan cells can be categorized into two primary components: the cytoplasm and the nucleus.

Inland fisheries are important global contributors to food security, livelihoods, and ecosystem services. A report on the global snapshot of expert-perceived impacts of COVID-19 on inland fisheries has been submitted by Stokesa et al, (2020). They studied an online survey to determine perceptions of Inland fisheries pressures between June and July 2020. They also analysed pandemic impacts on inland fisheries, based on the responses analyzed against fish capture and human development index data.

Introduction
Veterinary embryology is a fundamental branch of veterinary science that focuses on the study of the development of embryos in animals, tracing the journey from the moment of fertilization to the point where a fully developed fetus is formed. This field is not just an academic endeavor but a critical component of veterinary practice, research, and animal husbandry. It offers profound insights into the origins of life, the complex processes that drive the formation of tissues and organs, and the ways in which genetic and environmental factors interact to shape the development of an organism. The field of veterinary embryology is vast and encompasses several stages of development. The process begins with gametogenesis, where the reproductive cells—sperm in males and ova in females—are produced through a process of meiosis. These gametes are haploid, meaning they contain half the number of chromosomes found in somatic cells. The union of these gametes during fertilization restores the diploid number of chromosomes, marking the beginning of a new individual organism. The fertilized egg, or zygote, is the starting point of embryonic development. Following fertilization, the zygote undergoes a series of rapid cell divisions known as cleavage. During cleavage, the single-celled zygote divides without growing, resulting in a cluster of smaller cells called blastomeres. This process continues until the formation of a structure known as the blastocyst, which consists of an inner cell mass that will eventually develop into the embryo, and an outer layer of cells called the trophoblast, which will form the placenta. The blastocyst is a critical stage in development as it is involved in implantation into the uterine wall, a necessary step for establishing a successful pregnancy. The next major phase in embryonic development is gastrulation, a highly orchestrated process that results in the formation of three primary germ layers: the ectoderm, mesoderm, and endoderm. These layers are the foundation for all the tissues and organs in the body. The ectoderm gives rise to the nervous system, skin, and sensory organs; the mesoderm

Hypothesis become theories and theories attain rank of laws after withstanding rigorous experimental tests. Feasibility of a process is confirmed in the laboratory. Qualitative and quantitative analyses give complete chemical picture of the substance. It is with these considerations in mind we proceed to learn what is there in a laboratory.

Volumetric Analysis Precautions

1. Use Clean Glassware: Ensure all glassware, such as burettes, pipettes, and volumetric flasks, is thoroughly cleaned and rinsed with distilled water to avoid contamination and ensure accurate measurements.

2. Clean Glassware Properly: Before use, all glass apparatus should be thoroughly cleaned with a cleansing mixture of potassium dichromate (K2 Cr2 O7 ) and concentrated sulfuric acid (H2 SO4 ) to remove any residual contaminants. After cleaning, rinse the glassware thoroughly with distilled water to ensure no traces of the cleansing mixture remain.

3. Proper Calibration: Calibrate all measuring instruments, including burettes, pipettes, and balances, before use to maintain accuracy in measurements.

4. Avoid Parallax Error: When reading the meniscus level in a burette or volumetric flask, ensure the eye is at the same level as the meniscus to prevent parallax error.

5. Use Correct Indicators: Choose the appropriate indicator for the titration based on the type of reaction and the pH range of the endpoint to ensure precise determination of the endpoint.

Nature has made such a beautiful system that a fruit does not spoil unless its outer covering is removed and till it is there on the plant. For example banana will not spoil for long time if we do not remove its peel. Similar is the case with apple, guava, mango and many other fruits and vegetables. But as soon as the outer covering is removed the damage begins and the commodity is spoilt very soon.

Preservation is extending shelf life of fresh or processed food by using various methods and prevention or reduction of spoilage. Better the preservation, lesser the spoilage, more the spoilage poorer and inefficient is the preservation.

Therefore, in order to prevent or reduce the spoilage, we have to first identify and understand the causes of spoilage. There are chiefly 3 agencies that cause spoilage in fruits and vegetables i.e. (i) microorganisms, (ii) enzymes & chemical changes and (iii) man, animals, rodents, insects, etc. For effective preservation we have to check the growth and activity of these spoilage causing agencies. So, in order to prevent spoilage and preserve a perishable commodity for long time the following principles and methods are to be followed.

3.1. Introduction

Food preservation can be defined as the science which deals with the process of prevention of decay or spoilage of food thus allowing it to be stored in a safe condition for future use. Scientifically, preservation may be defined as a science which deals with the process for prevention of decay. All foods gradually undergo deterioration or spoilage from the time they are harvested or manufactured. Some commodities spoil rapidly, while others can keep for longer but limited periods. Spoilage in the food products may be caused due to some physical, chemical and microbial changes during storage. The preservation of these products can be resulted by controlling following physical, chemical and microbial changes.

Analytical Chemistry

The science involving the determination of the constituents in terms of elements and compounds is called Analytical Chemistry. It is used to identify the substances found in a material and to quantify the exact amount of substances in them.

The basic principles involved in Analytical Chemistry are changes takes place in the substances by the process of combination, decomposition, replacement and double decomposition.

Providing balanced nutrition to different groups of dairy cows with varying production levels is a significant challenge for commercial dairy farmers. The production performance of dairy cows is directly influenced by the type of feed provided. Ensuring balanced nutrition is crucial to optimize productivity in milk production and reproduction while minimizing feed costs. Dairy cow rations should consist of high-quality forages, a balanced mix of grains and protein sources, essential minerals, vitamins, and other feed supplements. Proper feeding practices are essential to prevent under or overfeeding and ensure that cows receive the right amount and combination of feed ingredients.
Formulating well-balanced rations that meet the nutrient requirements of cows results in optimal feed digestion and utilization. Transitioning from traditional feeding systems to a total mixed ration (TMR) feeding system is recommended for efficient and profitable feeding of dairy cows. TMR feeding systems have been widely adopted in developed countries due to their effectiveness. Each mouthful of TMR provides a complete and balanced ration for the cows, reducing feed selection by the animals and promoting synchronization of carbohydrate and protein availability in the rumen, leading to lower rumen acidity.
TMR feeding systems offer benefits such as labor savings, the ability to feed various types of feeds, and ensuring a nutritionally balanced ration at all times. While TMR may pose challenges in meeting individual nutrient requirements for each cow, larger dairy farms with multiple groups of cows can effectively manage this issue. By providing a nutritionally balanced ration consistently, TMR feeding systems help cows consume energy close to their requirements while maintaining the physical characteristics of roughage necessary for proper rumen function, ultimately leading to optimal production and economic efficiency.

Body Parts of Farm Animals

It is important to know about the various terms used to indicate different body parts of the animals so that whenever a description of the animal/body part is presented, one could specifically understand it. Some of the terms used to point out different body points of common livestock species have been shown in Figure 2.1.1-2.1.5. Terms which are more frequently used for different livestock species have been depicted in Table 2.1.1.

Introduction

The microorganisms exist as single cell or cluster of cells capable of orderly growth, metabolism and reproduction in two identical daughter cells. These includes cellular organisms {protozoa, algae and fungi (Eukaryotes), bacteria and archaea (Prokaryotes)} and viruses (non cellular entities). The study of microorganisms contribute to understanding of :

1. Basic biological sciences - It acts as a tool for providing the basic information for life processes. The discovery of DNA, RNA, proteins and enzyme functions all came from microbial study.
2. Applied biological sciences - Medicine, agriculture, industry, plant and animal pathology, immunology, plant and animal nutrition, biotechnology all have origin from the understanding of the cell function and metabolism of microorganisms.

This chapter examines cytokines as essential signalling molecules that regulate immune and inflammatory responses. It introduces interleukins, interferons, chemokines, tumour necrosis factors and colony-stimulating factors. Their sources, target cells and biological actions are considered in relation to immune-cell activation, differentiation, migration and communication. The chapter explains important properties such as pleiotropy, redundancy, synergy and antagonism. It also covers antiviral activity, chemotaxis, inflammation, fever and the regulation of humoral and cell-mediated immunity. Special attention is given to excessive cytokine production, cytokine storms and septic shock. These questions help readers understand how cytokines coordinate protective immunity and contribute to immune-mediated disease.

A pH meter is very commonly used for the measurement of the reaction of a solution or a medium. The pH determination with the help of a pH meter is based on the measurement of the electromotive force (e.m.f) of a pH cell consisting of an electrode sensitive to W ions and a reference electrode.

The study of general reproduction and reproductive performance in animals is a vast and intricate field that spans across various species, habitats, and biological systems. Reproduction is a fundamental biological process that ensures the continuity of life across generations. It involves a series of complex physiological and behavioural events, from mating and fertilization to gestation and birth. The general reproduction and reproductive performance in domesticated animals is a fascinating and complex field that has significant implications for various aspects of human society, including agriculture, pet ownership, and conservation efforts. Domesticated animals encompass a wide range of species, from farm animals such as cows and chickens to pets like dogs and cats, and even animals kept for conservation or recreational purposes, such as horses and certain bird species. Each of these species has unique reproductive systems and cycles, and understanding these is crucial for effective management and care. For instance, the gestation period for dogs is typically around two months, while for horses, it’s closer to a year. Similarly, some birds, like parrots, may lay eggs only once or twice a year

Current Status of Seed Production

Organized seed production in the country became possible with the formation of National Seed Corporation (NSC) during 1963, which paved the way for a sound seed industry to come as a consequence of the introduction of hybrid technology during 1961-65. The release of high yielding dwarf varieties of wheat and rice by the 1960’s gave further impetus to the growth of the seed industry in the country. For the total area under cultivation of 26.7 m hac and 44.8 hac of wheat and rice respectively, the seed requirement for these two crops alone come to 32 lakh tones and 13 lakh tones respectively of which the varieties contribute about 98 per cent and the hybrids 2 per cent. Only about 10-15 per cent of the total requirement is met by the seed producers leaving the balance for the farmers to manage and the seed producers have to grab the opportunity to supply quality seed materials in order to increase the production.

Current Status of Seed Production

Organized seed production in India became possible with the formation of National Seed Corporation (NSC) during 1963, which paved the way for a sound seed industry to come as a consequence of the introduction of hybrid technology during 1961-65. The release of high yielding dwarf varieties of wheat and rice by the 1960’s gave further impetus to the growth of the seed industry in the country. For the total area under cultivation of 26.7 m ha and 65 per cent of the area) insect, disease and weeds (10-40 per cent loss) and also poor shelf-life. Hybrid technology have defined solution in several crop plants specially vegetables, cotton, rice etc. with the development of appropriate hybridization and seed production. In 1990-91, the area planted to ‘bought seed’ was about 10.35 per cent. The total ‘bought seed’ was estimated at around 5.91 lakh tonnes valued at Rs 679.80 crores. 

Pesticide poisoning occurs when a pesticide enters the body and interferes with the vital systems of the body. Symptoms can begin anything from 1/2 hour to 24 hours after exposure. The typical symptoms and signs of pesticide poisoning are: