eChapters

DNA replication. The double helix is unwound and each strand acts as a template. Bases are matched to synthesize the new partner strands.

DNA replication, the basis for biological inheritance, is a fundamental process occurring in all living organisms to copy their DNA. This process is “replication” in that each strand of the original double-stranded DNA molecule serves as template for the reproduction of the complementary strand. Therefore, following DNA replication, two identical DNA molecules have been produced from a single double-stranded DNA molecule. Cellular proofreading and error toe-checking mechanisms ensure near perfect fidelity for DNA replication.

In a cell, DNA replication begins at specific locations in the genome, called “origins”.

Unwinding of DNA at the origin, and synthesis of new strands, forms a replication fork. In addition to DNA polymerase, the enzyme that synthesizes the new DNA by adding nucleotides matched to the template strand, a number of other proteins are associated with the fork and assist in the initiation and continuation of DNA synthesis.

Livestock sector has emerged as one of the key components of agricultural growth in developing countries in last few decades. This sector plays a significant role in the economic progress of India as it contributes 26% to the agricultural GDP and provides employment to around 18 million people. Over 70% of the rural households in India depends on livestock farming for supplementary income and is considered as an important instrument in poverty alleviation. It provides the major extra contribution to agriculture through manure, fuel fertilizer, apart from meat and milk that grant a regular supplementary income and employment not only to producers but also to huge size of the population engaged in secondary and tertiary business related to livestock. The economy of Jammu and Kashmir is also agriculture dependent and is the main occupation of majority of the rural people who earn their livelihood from it. Census figures 2011 signify that about 73% of the population of J&K lives in rural areas and are associated with agriculture and allied sectors including livestock rearing as main occupation.

Decision Support Systems convert farm data into recommendations that improve livestock productivity, health and sustainability. This chapter explains data-driven, model-driven and knowledge-based systems and their principal components: data management, analytical models and user interfaces. Technologies such as IoT, artificial intelligence, machine learning and cloud computing support applications in feed optimization, disease prediction, reproductive management, milk production and animal-welfare monitoring. Dairy and poultry examples demonstrate how DSS can reduce operational costs and strengthen farm decisions. Implementation challenges include inadequate data quality, high costs, limited technical expertise and maintenance requirements. Future systems are expected to integrate blockchain, robotics, Edge AI and increasingly autonomous management technologies.

14.1 Culture from Urine

Infection of urinary tract due to microorganisms affect patient of all age group and both sex., and they vary in severity from an unsuspected infection to a condition of severe systemic disease. Urine is a ordinarily excellent culture medium for the multiplication of common pathogen of urinary tract. Most bacteria found in the urine are due to contamination of skin flora during passage and they tend to increase greatly, exceeding 10⁶/ml. When the bacterial count exceeds 10⁵ per ml of urine it indicates significant bacteriuria and is indicative of a urinary tract infection. Infection of the urinary tract may be limited to a single tissue/ organ or they may spread upward and involve the entire urinary system. Escherichia coli is the most common urinary tract pathogen. Pseudomonas aeroginosa causes another important urinary tract infection, which is characterized by blue green pus. Cystitis (inflammation of urinary bladder), Pyelonephritis (inflammation of the kidney) are permanent diseases of urinary tract.

Urinary tract infections are generally characterized by bacteriuria, bacteria in the urine. Quantitative microbiological assay of urine can identify the probable pathogen. For this purpose, calibrated loop- direct streak method and pour plate method are routinely used. Now-a-days commercially prepared special plastic device called the urine dip slide and diagnostic urine–culture called Bacturcult is being used for isolation and identification of microorganisms from genitourinary tract infections. The Bacturcult is a sterile disposable plastic tube coated with a special medium on its inner side for detection and identification of bacteriuria.

This chapter introduces the essential components of laboratory work that form the foundation for veterinary parasitology and molecular biology research. A well-equipped laboratory along with proper safety protocols and correctly prepared reagents, is the key to reliable experimental outcomes and a secure working environment.
The following sections describe the standard operating procedures and laboratory biosafety, standard equipment used in research work, and the fundamental principles of solution preparation. These basic laboratory skills are essential prerequisites for the specialised techniques covered in subsequent chapters on veterinary parasitology, molecular biology and bioinformatics. Understanding and applying these foundational concepts allows researchers to maintain experimental consistency, ensure reproducible results, and conduct investigations safely and efficiently. The methods and principles outlined here will be regularly applied throughout the various techniques detailed in this manual, serving as essential knowledge for all laboratory personnel as well short-term visitors.
1.1 Laboratory Standard Operating Procedures and Safety
Laboratory safety is fundamental to protecting personnel, maintaining sample integrity, and ensuring reliable experimental outcomes. This section outlines essential laboratory conduct, safety protocols for personnel and equipment, waste management, and emergency protocols for standard laboratories carrying out diagnostics as well as research.

The history of the pregnancy test is a meaningful history embedded in magic, myth, politics, and science. From ancient Egyptian to modern times, the pregnancy test holds a cultural omnipresence that forces women to confront their fertility, femininity, and their future. Today we know that a pregnancy test that detects the human hormone known as human chorionic gonadatropin (hCG) offers the quickest and most accurate result for determining pregnancy. HCG is secreted by the placenta after the fertilized egg implants in the uterus and can be detected in both urine and blood. Urine pregnancy tests are convenient for home use, but a doctor may also opt to test blood as it provides a quantitative hCG number. Both methods are highly accurate and common. Pregnancy tests, however, were not always so accurate or so culturally accepted.
 
The diagnosis of pregnancy requires a multifaceted approach using three main diagnostic tools. These are (a) history and physical examination, (b)laboratory evaluation, and (c) ultrasonography. Currently, physicians may use all of these tools to diagnose pregnancy at early gestation and to help rule out other pathologies.

Overpopulation in humans and street dogs to some extent is a global problem of significant magnitude, with grave implications for the future. The overpopulation of dogs and cats is becoming an increasing concern in most countries of the world. As the global human population explodes so to do the staggering numbers of many best friends. Not only does this overpopulation cause millions of deaths each year and immeasurable levels of suffering in unwanted animals, these animals can cause significant risks to human health.

Stray animals particularly dogs are source of dreaded diseases like rabies and other zoonoses, resulting in thousands of deaths annually. The management of wild and domestic animal population is step towards controlling the situation and fertility control techniques play a role in this. However, such technology is still in its infancy is yet to be used on a large scale.

Advancements made in immunology and improved methods for the isolation of antigens specific reproductive system have paved the way for the development of antifertility vaccines in the past two decades. These vaccines are generally based on their ability block an indispensable step in the reproductive process.

Embryo Transfer (ET) refers to the technique by which embryos are collected from the reproductive tract of female (donor) and transferred to that of another female (recipient) which carries it to term. The donor and recipient female are in same stage of estrous cycle. The main objective of ET is the improvement of animal population through maximum utilization of superior females and males. It allows faster progeny testing of both male and females. By obtaining and transferring embryos from pre-pubertal females shorten the generation interval from birth to reproductive age. The superior buffaloes will be sent for slaughter after getting lactation yield in metropolitan cities. Utilizing oocytes for In-vitro maturation (IVM) and In-vitro fertilization (IVF) from such slaughtered superior buffaloes can prevent wastage of genetic material. ET allows preservation of rare and extinct species and breeds of animal. ET can be used as a basic tool for twinning, cloning, sexing and to test chromosomal aberrations.

The study of the immune system, in its various aspects, is called immunology. Immunology is the branch of bioscience which deals with the defense mechanisms including all physical, chemical and biological properties of the organism that help it to combat its susceptibility to foreign agents and microorganisms. Immunology includes the development and functions of various components of immune system by which the body responds, destroys or neutralizes foreign agents or pathogens. It includes the study at cellular as well as molecular level. Immunology is an interdisciplinary subject which incorporates and requires the knowledge of many branches of biology like microbiology, biochemistry, molecular biology and clinical medicine.

Cell mediated immune response (CMI) is the major defense mechanism against intracellular microbes and tumor cells. It is mediated mainly by T lymphocytes. T cells originate in bone marrow but the maturation of T cells occurs in thymus.

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.

Kingdom: Protozoa
Phylum: Euglenozoa
Class: Kinetoplasta
Order: Trypanosomatida
Family: Trypanosomatidae
Genus: Trypanosoma
Members of the genus Trypanosoma are responsible for trypanosomosis in animals and human beings and are found in the blood vascular system and tissues all over the world. All the species of trypanosomes are transmitted biologically or mechanically through an arthropod vector except T. equiperdum, which is transmitted through coitus in equines.

Infectious diseases are the result of a complex interaction between the host and the microbes. Evasions of protective immunity by the parasites critically determine the survival and pathogenicity of the microbes. The invasion of the body by harmful microorganisms is called infection.

Bovine babesiosis is a significant febrile disease, primarily affecting cattle and buffalo, transmitted by ticks. The disease is marked by the rapid proliferation of parasites within the bloodstream, leading to the extensive destruction of red blood cells. This results in a cascade of clinical symptoms, including anemia, jaundice, hemoglobinuria, and splenomegaly, with the potential for severe cases to culminate in death. The acute form of bovine babesiosis is particularly severe, often characterized by these pronounced symptoms, which can lead to rapid deterioration in the affected animals. Babesiosis is not merely an acute illness but can also persist as a chronic infection. Chronic bovine babesiosis is typified by ongoing anemia and varying degrees of weight loss, reflecting the enduring impact of the parasite within the host. Economically, this disease poses a formidable challenge, especially in regions where cattle are most susceptible. Since the first description of Babesia bovis by Victor Babes in Romania in 1888, numerous distinct species have been identified, each contributing to the global burden of this disease (Hunfeld et al., 2008). The impact of bovine babesiosis on livestock improvement efforts in endemic regions is profound. The introduction of susceptible, naive animals into these areas often leads to significant losses, as these animals are highly vulnerable to the disease.

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)

1. Morphology of Bacteria
Structure of Bacteria
Bacteria are very small with a diameter of 0.5 – 1 μm in size. Due to this small size the surface area / volume ratio is very high compared to that of large organisms of similar shape. The large surface area compared to a small volume facilitates easy nourishment of all areas of the cell. So there is no circulatory mechanism to distribute the nutrients and there is little or no cytoplasmic movement within the cell.
i) Shape
Bacteria exhibit three types of morphology;
• Spherical - cocci (coccus) - Greek word kokkos, meaning a berry
• Straight rods - bacilli (bacillus) - Latin word bacillus, meaning a stick
• Helically curved rods -spirilla (spirillum)
Variations in these basic forms are also seen. Eg: cocobacillary, ovoid and filamentous.

1    General line of treatment of poisoning in animals

2    Systemic antidotes-dosage and method of treatment large animals

3    Small animals

4    Plant toxins

5    Zoo toxins

Zoonoses

Zoonoses are those diseases and infections which are transmitted between vertebrate animals and humans under natural conditions. The emergence of a pathogen into a new host species is called disease invasion or “disease emergence”.

Anthrax is a notifiable disease and primarily occurs in herbivores but it is a type of bio-terrorism agent and called as malignant pustule, malignant edema, woolsorters disease, ragpickers disease, maladi charbon, splenic fever etc. Causative agent is Bacillus anthracis contains vegetative spore and lethal dose is 2,500 to 55,000 spores.

Brucellosis is one of the world’s most widespread zoonoses caused by the genus Brucella. In human it is called Malta fever, Undulant fever, Mediterranean fever, Rock Fever of Gibraltar and Gastric Fever while in animals it is called Bang’s disease, Enzootic abortion, Epizootic abortion, Slinking of calves, Ram epididymitis and Contagious abortion etc. it is also called occupational disease.

Leptospirosis is a disease of animal sand humanbeings caused by genus Leptospira and called as Weil’s syndrome, Canicola fever, Canefield fever, 7-day fever, Rat Catcher’s Yellows, Autumn fever, black jaundice). Fletcher’s EMJH media is used to culture the organism.

Antimicrobial Resistance abbreviated as AMR is defined as the process by which microorganisms like bacteria, fungi, viruses, and parasites change over a period and become resistant to a drug to which they were earlier susceptible to. This makes the medicines ineffective for treatment overtime, thus making infections difficult to treat thereby increasing the risk of spread of diseases caused by them and severe illness which may lead to death. This in turn necessitates the need for development of newer antibiotics. However, there has been a sharp decline in the development and manufacture of new antibiotics in the recent years resulting in development of only few antibiotics in the past two decades. The increase in emergence of antibiotic resistance concurrent with decline in development of newer antibiotics poses a serious threat to health of both humans and animals. Every year about 700,000 deaths have been reported to occur due to resistant infections and this rate is likely to increase further with estimated infections due to resistant pathogens expected to reach over 50 million globally by 2050 (O’Neill, 2016). The worrisome trends of increasing antimicrobial resistance across the globe poses a serious threat to both animal and human health as AMR not only increases the morbidity and mortality rates but also increases the economic burden on health care (Zhu et al., 2022). This presents an extremely grave situation as the supply of new antibiotics is inadequate to cope with the increase of AMR pathogens. The unnecessary use of antibiotics globally especially in the livestock sector as growth promoter further helps in selective enrichment of AMR pathogens which further increases health risks. It is well known that resistant pathogenic and commensal bacteria can persist and spread within and between premises despite zero antimicrobial drug use. This may be explained due to maintenance, replication, and further dissemination of resistance genes by horizontal transfer of genes via natural ecosystem and can occur either by conjugation, transformation and transduction; and these mechanisms can rapidly spread AMR genes among microbial community in natural environment and human microbiome, where these resistant bacterial species may be selected due to presence of antimicrobial drugs (Zhu et al., 2022). The physical transfer of bacteria via movement of animals, workers, and equipment and ineffective cleaning and disinfection may also be responsible for increasing the AMR pathogens in the natural environments.