eChapters

Introduction
Helminths are a group of internal parasites of animals and human beings that usually infest gastrointestinal tract that feed from the host which provides protection to the parasite. The infestation cause loss of blood and nutrients from the host, making it weak, and vulnerable to other infections. There can be injury to other organs due to the migration of different stages of the parasite, formation of cysts or secretion of toxins that can cause damage.
The heminths belong to two phyla including nemathelminthes which are round worms and Platyhelminthes that has flukes, and tapeworms. Nematodes are round worms who have a resistant cuticle and most of them have separate sexes with direct or indirect life cycle. The major nematodes include Ascarids, Strongyles, strongyloides, Trichostrongyles, Filarids, Trichuris etc. Tape worms have a flat body with a head or scolex, neck and strobili having proglottids. They are hermaphrodites and the proglottids contain reproductive organs. They require more than one host for completion of life cycle. The flukes are ususally leaf like , unsegmented and have suckers that help them to attach to the internal organs of the host. They also have a life cycle in more than one host.

The kidney plays a role in controlling the volume of different bodily fluids, fluid osmolality, acid-base balance, toxin elimination, and different electrolyte concentrations. The glomerulus filters one-fifth of the volume of blood that enters the kidneys. Among the compounds that are reabsorbed include amino acids, salt, bicarbonate, glucose, and solute-free water. Among the chemicals that are released are ammonium, potassium, hydrogen, and uric acid. The kidneys maintain homeostasis, eliminate metabolic waste products like uric acid, urea, creatinine and ammonia, regulate extracellular fluid volume, blood pressure (via the rennin-angiotensin system) and controlling systemic pH (via regulation of H+ and HCO3- concentration).
Among various kidney diseases, especially chronic kidney disease (CKD) is a slow loss of kidney function in which, kidney dysfunction is present for more than three months. There are six progressive stages of CKD i.e. stages 1, 2, 3a, 3b, 4 and 5. The stages are based on the results of glomerular filtration rate (GFR) test (1). In stage 1 there is mild kidney damage, while in stage 5 kidneys lost their working capacity. Chronic kidney disease (CKD) is a worldwide health issue that is becoming more prevalent in both developed and developing nations. It typically affects adults. .

Nervous system Disorders in Domestic Animals
Nervous system disorders in domestic animals encompass a range of conditions that affect the brain, peripheral nerves, and spinal cord. These disorders can result in a variety of clinical signs, depending on the area of the nervous system involved. Infectious disorders like rabies, canine distemper, toxoplasmosis, listeriosis. Congenital and developmental disorders like hydrocephalus, cerebellar hypoplasia and chiari-like malformation can cause these disorders. Traumatic and degenerative disorders like Intervertebral Disc Disease. Degenerative myelopathy, metabolic and toxic disorders like hepatic encephalopathy, hypocalcemia, lead poisoning, organophosphate toxicity, autoimmune and inflammatory disorders like meningitis and meningoencephalitis may also lead to nervous system disorders. Some tumours associated with nervous system like meningiomas and peripheral nerve sheathtumours also cause nervous system disorders.  

1. ABSORPTION

Deals with the translocation of the xenobiotics. Passage of toxicant from site of adminstration to blood stream or systemic circulation.

Translocation may occur by following processes

a) Simple /Passive diffusion - most common route by which xenobiotic pass through the membranes:

? Down hill transport, No energy involvement

? It is not substrate specific.

? Small molecular weight (600) hydrophilic toxicants cross membranes by simple diffusion through aqueous pores.

? High molecular wt. hydrophobic molecules diffuse across the lipid domain of membranes.

? Follows Ficks Law of diffusion

? The rate of diffusion depends on their lipid: water partition coefficient value, Conc. Gradient, degree of ionization.

? Higher lipid: water partition coefficient and lower degree of ionization favours absorption of toxicants by this process.

Introduction

Acute lung injury (ALI) is the manifestation of an inflammatory response of lung resulting from severe sepsis, bacterial or viral pneumonia, trauma, and burns in animals (Ali et al., 2020).It is distinguwashed by disruption to the alveolar capillary membranes, atelectasis of the pulmonary airspaces, and neutrophil and protein-rich fluid infiltration into the alveolar space (Li et al., 2019). Although advances in treatment, the disability and fatality rates of ALI remain high, that is around 30-40% (Ali et al., 2020). At the moment, new therapeutic alternatives are urgently required to treat ALI. As a result, this is a very active area of research to understand the molecular principles underlying pulmonary inflammation and ALI (Reiss et al., 2012). The use of animal models of inflammatory lung has allowed for the probing of pathways of inflammation responsible for injury. Specially, rodent models may serve a link between in vitro research to large animals and clinical studies by allowing for high quantities of samples under physiological circumstances at low expenses (Domscheit et al., 2020).LPS, found in the outer membrane of gram-negative bacteria, consists of a polar lipid head group (lipid A) and a chain of repeating disaccharides (Gao et al., 2023). LPS induced lung injury model, closely mimic sepsis and inflammatory lung diseases, is a well-establwashed model in this field of research (Reiss et al., 2012). To mimic acute lung injury, LPS can be administered either directly through intratracheal or intranasal route (direct pulmonary insult) or indirectly through intraperitoneally and intravenous routes (indirect extra pulmonary insult) (Perl et al., 2011). This chapter focuses mostly on rodent model of acute lung injury caused by lipopolysaccharide (LPS), both direct and indirect. Additionally, it also includes the characteristics and underlying molecular mechanism of LPS induced lung injury along with applications in drug development.

Introduction

The immense use of chemicals and pharmacological entities has put the public health at brisk of potential health hazards. These substances in modern days are presented in the form of common constituents of food, medicines, beverages and junk foods etc. However, long term consumption of these substances might be responsible for chronic toxicity, but the accidental ingestion of large quantities of these substances may result into adverse acute toxic reactions. Hence an experimenter should have the acumen to develop and perform the acute toxic tests in order to find out the lethal dose 50 i.e. LD50 of the substances.

Acute Toxicity Studies

Acute toxicity studies helps to establish the dose dependent adverse effect including mortalities. The LD50 has been used as a major parameter in screening of pharmacological agents for acute toxic potential. Apart from mortality, other biological effects and the time of onset, duration and degree of recovery on survived animals, are also important in evaluation of acute toxicity. Hence, acute toxicity study solely gives information about LD50, therapeutic index and the degree of safety of a pharmacological agent.

Acute toxicity is defined as adverse effects occur following oral or dermal administration of a single dose of a substance, or multiple doses given within 24 hours, or an inhalation exposure of 4 hours. Oral administration is the most common form of acute systemic toxicity testing.

This chapter examines the principles, preparation and application of vaccines and biological products. It compares live attenuated, inactivated, toxoid, subunit, recombinant, vector, DNA and mRNA vaccines. Vaccine development phases, immunogenicity, safety, efficacy and post-marketing surveillance are introduced. The chapter discusses adjuvants, including alum, Freund’s adjuvants, liposomes, ISCOMs and delivery systems. Important veterinary vaccines for brucellosis, foot-and-mouth disease, anthrax, Newcastle disease, infectious bronchitis, goat pox, sheep pox and peste des petits ruminants are covered. Questions also address bacterins, toxoids, attenuation, booster requirements and reversion to virulence, providing practical knowledge of immunoprophylaxis in animal-health management.

1    Ruminants
2    Canines

Aluminium is a ubiquitous metal and seen in an environment. Source of aluminium happens through dietary souce, food addivitives, packing materials, medications, environmental exposure as well as occupational exposure. Toxico kinetics is related to the interaction of aluminium with biological systems and toxicity also. Toxico dynamics of aluminium is related to the the oxidatve stress, neuro toxicity and bone toxicity. Diagnosis is based on MRI scan and measurement of serum as well as urine. Treatment is dependent on chelation therapy as well as avoidance of exposure. Finally it is concluded that aluminium toxicity leads to health risks in a significant manner along with potential adverse effects on neurological, gastro, intestinal, renal as well as skeletal systems.

Introduction

Aluminium is a ubiquitous metal observed naturally in the environment. It is widely used in various industrial and consumer products including cookware antacids, vaccines, and food additives. While aluminium is normally considered safe in low concentrations and exposure to high levels can lead to toxicity causing a range of adverse effects on human health. In this comprehensive article, authors will provide information regarding its toxicokinetics and toxicodynamics, clinical signs and symptoms, associated lesions, diagnosis and treatment strategies.

Cadmium, a roxic heavy metal, poses risk in a significant manner especially to human health and the environment. It's wide spread industrial use and presence in various products make exposure a concern particularly for both environmental and occupational settings. Understanding the source, toxico dynamics, toxico kinetics, clinical manifestations, diagnosis as well as treatment of cadmium poisoning is critical in mitigating it's adverse effects especially on human health. Cadmium gains an entry into the environment through natural processes namely volcanic activity as well as weathering of rocks. Whatever it may be, human activities along with mining, smelting, refining of metals and manufacturing of batteries, plastics as well as pigments, are major contributors to cadmium release especially into the environment. Additionally, cadmium is seen in tobacco smoke, resulting in exposure among smokers as well as passive smokers. Once released into the environment, cadmium gains entry into the human body through many routes such as inhalation, ingestion and dermal contact An inhalation of cadmium containing dust or fumes is a prominent route of exposure in an occupational settings especially in industries namely mining, smelting as well as welding. The consumption of contaminated water and food is another general route of exposure especially for the general population. After consumption, cadmium in essential manner accumulates especially in the kidneys as well as liver with a half life of approximately 10 - 30 years in the organs. It also accumulates particularly in bones, where it consists of half life of several decades.

The usage of different pure chemicals and their combinations in treating various disorders of the livestock has been listed in this chapter.

The drug action can be adversely affected by the presence/concomitant administration of another drug/ agent, may be inhibiting its absorption, metabolism or excretion. Some of the drugs are incompatible with IV fluids, resulting in their inefficacy. The important drug interactions to be taken into consideration while administering a drug, are tabulated in this chapter.

1    Consent form for surgery

2    Consent form for euthanesia

3    Slaughter certificate

4    Wound certificate

5    Proforma for export certificate of dogs

1. Introduction
Animal experimentation remains a cornerstone of scientific research in many fields, from medical advances to pharmaceutical testing. However, the ethical treatment of laboratory animals has become a point of significant concern worldwide. India, through the Committee for the Control and Supervision of Experiments on Animals (CCSEA), ensures that ethical standards are maintained in research institutions. Established under the Ministry of Environment, Forests, and Climate Change (MoEF&CC), CCSEA is tasked with overseeing the use of animals in experiments, ensuring that procedures adhere to ethical guidelines and international norms. CCSEA’s guidelines are in line with international standards set forth by organizations such as the International Council for Laboratory Animal Science (ICLAS) and the European Union (EU), but they are tailored to address local needs and conditions. The guidelines, which focus on the welfare of laboratory animals, emphasize the ethical review process, animal care, and the importance of minimizing animal suffering. They also stress the need for researchers to implement the 3Rs—Replacement, Reduction, and Refinement—to minimize the use of animals and ensure humane practices in research. This chapter explores the CCSEA guidelines in detail and compares them with animal welfare regulations from around the world, including the United States, European Union, Japan, and Australia. By understanding the similarities and differences between these regulations, researchers and policymakers can ensure the ethical treatment of laboratory animals on a global scale.
2. Objectives of CCSEA Guidelines
The main objective of the CCSEA guidelines is to ensure that laboratory animals are treated ethically and humanely while also supporting the validity and scientific rigor of research. The guidelines encourage researchers to prioritize animal welfare while minimizing unnecessary suffering. Specifically, CCSEA focuses on:
1. Ethical Treatment of Animals: Ensuring that animals are housed in suitable conditions, given adequate veterinary care, and provided with a comfortable environment to reduce stress.
2. Justification of Animal Use: Ensuring that animals are used only when necessary, and that their use is scientifically justified.
3. Pain and Stress Minimization: Ensuring that experimental procedures cause the least pain, distress and suffering possible.

Introduction
The use of animals in scientific research has been a cornerstone of medical advancements for decades. However, this practice has also been the subject of intense ethical debate. This lecture explores the necessity of animal experimentation, the ethical considerations involved, and the regulatory frameworks in place to ensure the humane treatment of laboratory animals.
The Need for Laboratory Animals
Animal experimentation has played a crucial role in numerous medical breakthroughs. The importance of laboratory animals in research cannot be overemphasized. Among the various purposes for which humans use animals, experimentation involves relatively few animals and serves a noble purpose in advancing scientific knowledge and human health.
Laboratory animals are invaluable in the drug development process for several reasons:
• Similarity to human organ systems, metabolism, and enzyme functions.
• Suitability as alternatives to human subjects.
• Small size and ability to be reared in controlled environments.
• High reproductive rates.
• Potential for genetic purity, leading to reproducible and reliable results.
The Importance of Animal Welfare
While the benefits of animal experimentation are clear, it’s equally important to consider the ethical implications of using animals for research. The concept of animal welfare is embedded in the Indian Constitution, which states that it is the duty of every citizen “to protect and improve the natural environment including forests, rivers, lakes and wildlife, and to have right compassion for the living creatures” (Article 51 A (g)). This ethical consideration for animals has been emphasized by philosophers, spiritual leaders, and scientists throughout history:

Introduction
Good Laboratory Practice (GLP) has been a cornerstone of laboratory operations, ensuring quality, reliability, and reproducibility in research and development across various fields, including pharmaceuticals, biotechnology, and environmental science. As we move further into the 21st century, the landscape of GLP is evolving rapidly, influenced by technological advancements, regulatory changes, and the increasing complexity of scientific research. This article explores future trends and innovations in GLP, delving into key areas such as automation, data management, regulatory shifts, and sustainable practices.
1. The Role of Automation in GLP
1.1 Increased Efficiency and Accuracy
One of the most significant trends in GLP is the integration of automation. Laboratory automation includes the prompt use of technology to perform tasks in a much efficient way with minimal human interventions, thus significantly increasing efficiency and accuracy of laboratory practices. Automated systems can handle repetitive tasks such as liquid handling, sample preparation, and data analysis, reducing the potential for human error.
Benefits of Automation
• Reduction of Human Error: Automation minimizes the chances of mistakes that can occur when humans perform these repetitive tasks, thereby improving the reliability of the results.
• Speed up the Research Process: For example, robotic systems can be used in drug discovery. These systems can conduct high-throughput screening, which means they can quickly test thousands of different compounds for potential effectiveness as drugs.

Introduction

While experimenting with chemicals, sometimes we need to dry the chemical/ solution (solid, liquid or gas) using a process like evaporation or distillation, mainly to remove water or different solvents. Drying is the process of evaporation or distillation to remove water/solvent from a solution, solid or even from gas. Generally, a drying agent (usually an anhydrous inorganic salt) is used for this process, which reacts with the water (present in the chemical/ solvent to be dried) to form a hydrate. For example, anhydrous MgSO4 is one of the drying agents. The drying agents are recognized by their capacity (the rate at which they absorb water) and their intensity (the amount of water left behind in the solvent at equilibrium). No chemical reaction or change in phase occurs during the drying process.

Type of Solvents

Apart from water (a universal solvent), there are three families of organic solvents used in laboratories.

1) Oxygenated solvents: Alcohols, Ketones, Glycol ethers, Glycol esters, etc.

2) Hydrocarbon solvents: Aliphatic and Aromatic hydrocarbons.

3) Halogenated solvents: Chlorinated hydrocarbons.

Introduction

For agricultural applications as well as for research work, often we need to prepare solutions of different agrochemicals of varying strength, as per the requirements. Agrochemicals are used to help crop plants grow, produce, and protect them from biotic/abiotic stresses. Many of the agrochemicals (insecticides, herbicides, fungicides, rodenticides, molluscicides, nematicides, etc.) are used to protect the crop from insect pests and diseases. However, some of them (fertilizers and soil conditioners) are used to augment crop yield. While in the previous chapter (Chapter 8) we discussed about preparation of laboratory solutions, in this chapter we will briefly discuss about the preparation of different agrochemicals.

Agrochemical/agrichemical is a generalized term used for the chemicals applied in agriculture. In general, it also includes the feed-supplements used in f isheries and animal husbandry.

Agrochemicals

Fertilizers

Fertilizers are used to augment growth of crop plants and to mitigate nutrient deficiency in the soil. Fertilisers can be organic (containing natural substances, prepared through natural processes) and inorganic fertilisers (synthetic fertilizers, manufactured artificially using chemical processes using natural deposits, by chemical alterations).

Soil Conditioners

Soil conditioners include manure, livestock and leaf compost, peat that help making the soil in good condition. They are laid on the top soil and then mixed properly. They not only increase nutrient contents in the soil but also improve aeration and water holding capacity.

AMR has been prevalent in almost all European countries from past decades. A 2021-2022 report published by the European Food Safety Authority (EFSA) and the European Centre for Disease Prevention and Control (ECDC) on AMR in zoonotic and indicator bacteria from humans, animals and food origin reported vast differences in antimicrobials resistance levels among the European countries, with comparatively higher AMR percentages in the southern and eastern parts of Europe (ECDC, 2022, 2023). The resistance levels ranged from very high for tetracyclines, sulfonamides and ampicillin, moderate for ciprofloxacin to low levels for third-generation cephalosporins (cefotaxime and ceftazidime) in human cases infected with Salmonella spp. in 2022 (ECDC, 2023). The trends are dynamic and over a decade of 2013 2022, the human isolates from 12 and 15 countries reported a statistically significant reduction in tetracycline and ampicillin resistance, particularly for S. typhimurium (ECDC, 2023). The ciprofloxacin and cefotaxime combination, a highest priority critically important antimicrobials (CIA), had very low and rare resistance levels for Salmonella isolates of humans and animal and their derived meat.

Livestock species wise variation was also observed in the resistance pattern in imported meat, being higher in poultry meat isolates compared to pig or cattle meat for Escherichia coli (ECDC, 2023). High to extremely high levels of f luoroquinolone resistance from Campylobacter jejuni and C. coli of both human and animal origin isolates exist, due to which the fluoroquinolones can no more be used as a treatment option for human Campylobacter infections (ECDC 2023). The combined occurrence of erythromycin resistance and ciprofloxacin in Campylobacter spp is considered of high public health importance, and the report mentioned that the combined resistance for these antimicrobials was higher in C. coli compared to C. jejuni from food-producing animals and humans. However, while the ciprofloxacin resistance showed an increase in over 13 study countries, seven countries reported reduced erythromycin resistance for C. jejuni. Overall, resistance to conventional antimicrobials was frequent in Campylobacter and Salmonella from humans and animals. Increasing trend in resistance to one of two CIA for treatment in humans has been observed in poultry-originated Salmonella serovars and Campylobacter while combined resistance was is low in few Salmonella serovars and C. coli isolates from humans and animals in some countries (ECDC, 2023).

1. Introduction

Medicinal plants are rich source of novel drugs that forms the ingredients in traditional systems of medicine, modern medicines, nutraceuticals, food supplements, folk medicines, pharmaceutical intermediates, bioactive principles and lead compounds in synthetic drugs (Ncube, 2008).  In recent years, antibiotic resistance has become a global concern. This drives the need to screen medicinal plants for novel bioactive compounds as they are biodegradable, safe and have fewer side effects (Prusti et al., 2008). Higher plants, as a source for new potential drugs is still largely unexplored and screening of active agents helps to design the lead molecule later in drug development.

Aegle marmelos(L.) Corr., belongs to the family Rutaceae, and is popularly known as Vilvam tree (Tamil) (Gamble, 1935; Mathew, 1983). It is an indigenous tree found in Iran, India, Myanmar, Pakistan, Bangladesh and most of Southeast Asian countries (Singh, 2009).  A. marmelos has been used from time immemorial in traditional systems of medicine for relieving diarrhoea, dysentery, stomachic, digestive, astringent, peptic ulcer and respiratory infection (Nadkarni, 2000). The fruit, leaves, bark and root are edible and possess medicinal values. The unripe dried fruit used to be astringent, digestive and stomachic, the ripe fruit is aromatic, cooling and is used as laxative.