UPSC Animal Husbandry & Veterinary Science 2022 — Paper II

The directive 'discuss' requires a balanced exposition of facts with critical commentary across all five sub-parts. Allocate approximately 30 words (20% time) per sub-part, ensuring each response has a mini-introduction, core content with anatomical/physiological/pathological details, and a brief clinching statement. Prioritize precision over elaboration given the severe word constraint; avoid overlapping content between sub-parts.

• (a) Sweat glands: Structure (simple tubular, apocrine/eccrine distribution in species), thermoregulatory function, species variation (horses abundant, cattle/poorly developed), and role in electrolyte balance
• (b) Antimuscarinic agents: Atropine/glycopyrrolate mechanism (M-receptor blockade), pre-anaesthetic indications (salivary/bronchial secretion reduction, vagal blockade), side effects (tachycardia, ileus), and species-specific considerations
• (c) Hypocalcemic tetany: Parturient paresis pathophysiology (abrupt Ca demand vs. PTH response failure), clinical signs (recumbency, S-bend neck, subnormal temperature), and emergency therapy (IV calcium borogluconate with cardiac monitoring)
• (d) Thiamine deficiency: Polioencephalomalacia etiology (thiaminase in raw fish/bracken fern, amprolium antagonism), neurological signs (star-gazing, opisthotonus, blindness), and therapeutic response to thiamine HCl
• (e) Rabies neurological implications: Negri bodies pathognomonic significance, ascending paralysis progression, behavioral changes (furious vs. dumb form), zoonotic implications, and OIE/WHO One Health relevance in Indian context

Begin with a precise definition of placenta as the directive demands, then systematically address all three sub-parts: spend approximately 40% of effort on part (a) given its 20 marks, covering histological classification with clear examples; allocate 30% each to parts (b) and (c), ensuring autonomic drug mechanisms are explained with specific receptor actions, and surgical management includes both diagnostic techniques and operative procedures for choke and hernia in cattle.

• Part (a): Definition of placenta as fetomaternal organ for physiological exchange; histological classification into epitheliochorial (mare, sow), syndesmochorial (cow, ewe), endotheliochorial (carnivores), and hemochorial (primates, rodents) with structural basis of chorionic epithelium layers
• Part (a): Gross classification correlation—diffuse (horse, pig), cotyledonary (ruminants), zonary (carnivores), discoidal (primates)—linking to histological types
• Part (b): Classification into cholinergic (direct-acting like acetylcholine, methacholine; indirect-acting like neostigmine, physostigmine) and adrenergic (alpha agonists like phenylephrine, beta agonists like isoproterenol, blockers like propranolol, atropine)
• Part (b): Mechanism specificity—nicotinic/muscarinic receptor agonism/antagonism, acetylcholinesterase inhibition, alpha/beta adrenergic receptor subtypes and G-protein coupled signaling pathways
• Part (c): Choke diagnosis—esophageal obstruction history, regurgitation, saliva drooling, ruminal tympany, passage of stomach tube; hernia diagnosis—reducible/irreducible swelling, palpation of ring, ultrasonography for contents
• Part (c): Surgical management—choke: rumenotomy for proximal obstruction, esophagotomy for distal; hernia: herniorrhaphy with ring closure, mesh repair for large defects, postoperative care with antibiotics and analgesics

The directive 'discuss' for part (a) requires comprehensive, analytical coverage with interconnections between etiology, epidemiology and control; 'describe' in part (b) demands precise anatomical detailing with topographic application; while part (c) needs systematic enumeration with clinical reasoning. Allocate approximately 40% of effort to part (a) given its 20 marks and multi-component demand, 35% to part (b) for its anatomical complexity and diagrammatic potential, and 25% to part (c). Structure with brief introductions for each part, systematic body coverage, and integrated conclusions linking FMD control to vaccination failure and abdominal examination to diagnostic practice.

• Part (a): FMD virus classification (Picornaviridae, Aphthovirus, 7 serotypes), transmission dynamics including carrier state in ruminants, vesicle pathogenesis with histological changes, differential diagnosis from vesicular stomatitis and BVD, FMD-CP (Control Programme) with stamping-out policy and ring vaccination in India
• Part (a): Economic impact and OIE (WOAH) notifiable status, emergency vaccination protocols, biosecurity measures including 21-day movement restrictions, and recent DIVA (Differentiating Infected from Vaccinated Animals) marker vaccine strategies
• Part (b): Complete boundaries—cranial (diaphragm), dorsal (lumbar vertebrae and muscles), lateral (abdominal muscles and ribs), ventral (floor muscles), caudal (pelvic inlet); organ listing by species-peculiarity including rumen compartments, reticulum, omasum, abomasum, liver, spleen, intestines, kidneys, and reproductive organs
• Part (b): Nine-region division using two horizontal planes (last rib and tuber coxae) and two sagittal planes (midline and paralumbar fossa boundaries); clinical importance for rumenotomy site selection, abomasal displacement localization, peritonitis diagnosis, and trocarization/cannulation sites
• Part (c): Vaccination failure categories—antigenic (strain mismatch, inadequate antigen mass), host-related (immunocompromised status, maternal antibody interference, genetic non-responder), procedural (cold chain breach, improper route/interval, adjuvant incompatibility), and environmental (concurrent infection, nutritional deficiency, stress)

The question demands explanatory depth across four distinct sub-parts with varying mark weights. Allocate approximately 20% time/words to (a)(i) on equine colic (10 marks), 20% to (a)(ii) on DNA fingerprinting (10 marks), 30% to (b) on female fowl reproductive anatomy (15 marks), and 30% to (c) on environmental effects (15 marks). Structure with brief contextual introductions for each sub-part, followed by systematic explanatory body paragraphs, and conclude with integrated insights on how modern diagnostic tools and environmental management converge for optimal animal health.

• (a)(i) Etiology of equine colic: dietary factors (sudden feed change, low forage), management factors (stall confinement, inadequate water), parasitic load (Strongylus vulgaris), and anatomical predisposition; treatment protocols including medical management (analgesics, antispasmodics, fluids) and surgical intervention criteria
• (a)(ii) DNA fingerprinting applications: disease outbreak tracing (FMD virus lineage analysis), reservoir identification, transmission pathway mapping, vaccine strain matching, and wildlife-livestock interface disease ecology; mention RFLP, PCR-based methods, and whole genome sequencing
• (b) Functional anatomy of female fowl: left ovary-oviduct dominance, sequential maturation of follicles, five functional regions of oviduct (infundibulum, magnum, isthmus, uterus, vagina) with secretory specializations, clutch formation physiology, and regression of right gonad
• (c) Environmental effects: thermal stress on hypothalamic-pituitary-gonadal axis, photoperiod manipulation for seasonal breeders, humidity-mycotoxin interactions, heat stress-induced embryonic mortality, and shelter design for thermoregulation
• Integration point: connection between molecular diagnostics (a)(ii) and environmental disease management (c) for One Health implementation

The directive 'discuss' requires balanced exposition with critical coverage of all five sub-parts. Allocate approximately 30 words per mark (150 words × 5 parts), spending roughly 2 minutes per sub-part. Structure each part as: brief definition → key features/processes → significance/limitations. No unified conclusion needed; each sub-part stands independently. Prioritize technical precision over narrative flow given the diverse topics spanning wool technology, dairy chemistry, zoonoses, animal welfare, and milk powder defects.

• (a) Worsted system: Parallel fiber arrangement, combing process, removal of short fibers (noils), production of smooth, lustrous, durable yarn; contrast with woolen system; specific end-uses (suiting, fine apparel)
• (b) Platform tests: MBRT (Methylene Blue Reduction Test), COB (Clot on Boiling), acidity test (°SH), specific gravity (lactometer reading), sediment test; rapid field applicability for milk procurement at village level
• (c) Occupational zoonoses: Brucellosis (abattoir workers), Q-fever, leptospirosis, anthrax, tuberculosis, rabies; exposure routes (contact, aerosol, vector); preventive measures (PPE, vaccination, hygiene protocols)
• (d) Preslaughter care: Lairage management, rest period (24-48 hours), withdrawal of feed (12-24 hours) with water ad libitum, humane handling to prevent DFD and PSE conditions; animal welfare and meat quality nexus
• (e) Milk powder defects: Whey taint, stale/oxidized flavor, scorched particles, caking/insolubility; causes (preheating temperature, moisture content, storage conditions, fat oxidation); prevention (nitrogen flushing, moisture control, antioxidant addition)

The directive 'discuss' requires comprehensive, analytical coverage across all three sub-parts. Allocate approximately 40% of time/words to part (a) given its 20 marks, and 30% each to parts (b) and (c). Structure with a brief integrated introduction, then three distinct sections addressing each sub-part sequentially, followed by a synthesizing conclusion that connects technological advancement with welfare considerations.

• Part (a): Pre-slaughter handling, stunning methods (electrical, CO2), bleeding techniques; ante-mortem and post-mortem inspection protocols; preservation methods (chilling, freezing, MAP, chemical preservatives) and spoilage control
• Part (b): Precise definition of homogenisation; mechanical process details (piston/plunger homogenizer, two-stage pressure 2000-2500 psi); effects on fat globule size distribution; merits (improved stability, digestibility, palatability) and demerits (oxidative rancidity, increased cost, light sensitivity)
• Part (c): Prevention of Cruelty to Animals Act 1960, Wildlife Protection Act 1972, Transport of Animals Rules 1978/2001, Slaughter House Rules 2001, PCA (Slaughter House) Rules 2001; recent judgments like Nagaraja (2014) on jallikattu
• Integration: Connection between humane slaughter in (a) and welfare laws in (c); quality milk production standards bridging technology and welfare
• Contemporary relevance: FSSAI regulations 2011, India's ranking in Animal Protection Index, recent amendments to livestock transport rules

The directive 'discuss' requires comprehensive, analytical coverage with balanced elaboration across all three sub-parts. Allocate approximately 40% of time/words to part (a) given its 20 marks, and roughly 30% each to parts (b) and (c). Structure with a brief composite introduction, then dedicated sections for each sub-part with clear sub-headings, and a synthesizing conclusion linking food safety themes across all parts.

• Part (a): Definition of fraudulent substitution (replacement of meat with cheaper/undesirable species, non-meat proteins, or adulterants) and comprehensive coverage of detection methods—organoleptic, microscopic (histological), electrophoretic (species-specific proteins), PCR/DNA-based (mitochondrial cytochrome b, 12S/16S rRNA genes), ELISA, and advanced techniques like NIR spectroscopy and DNA barcoding
• Part (b): Detailed classification of microbial spoilage types in milk—souring (lactic acid bacteria), sweet curdling (rennet-forming bacteria like Bacillus), proteolysis (Pseudomonas, Bacillus), lipolysis (psychrotrophs), ropiness (Alcaligenes viscolactis, Enterobacter), colour changes (Pseudomonas syncyanea, Flavobacterium), and gas production (yeasts, coliforms); mention psychrotrophic spoilage in cold chain
• Part (c): Epidemiological tools for air-borne diseases (cough droplet nuclei, airborne infection study—Wells-Riley equation, ventilation assessment, UV germicidal irradiation studies, outbreak investigation like TB in cattle) and water-borne diseases (case-control studies, cohort studies, molecular epidemiology—PFGE, WGS for source tracking, sanitary surveys, water quality monitoring—MPN, membrane filtration, risk assessment models)
• Integration of One Health perspective across all parts—linking meat/milk safety with zoonotic disease transmission and public health outcomes
• Mention of Indian regulatory context: FSSAI regulations (Food Safety and Standards Act 2006), BIS standards for meat products (IS 2537), Prevention of Food Adulteration Act relevance, and ICAR/IVRI research contributions to detection methodologies

The question demands detailed explanatory responses across three distinct technology domains. Begin with a brief introduction acknowledging the importance of value-added dairy products, by-product utilization, and meat preservation in the Indian livestock economy. For part (a), allocate approximately 40% of time/words (20 marks) covering ice-cream preparation with a properly labelled flowchart, FSSAI legal standards (FSSAI, 2011), and defects like sandiness and shrinkage. For part (b), spend ~30% (15 marks) describing wet rendering, dry rendering, and steam rendering methods for fallen carcasses with their comparative advantages. For part (c), allocate remaining ~30% (15 marks) discussing canning steps from pre-cooking to cooling, and can defects including hydrogen swell and pinholing. Conclude by emphasizing food safety and economic significance in the Indian context.

• Part (a): Ice-cream preparation flowchart showing mixing → pasteurization → homogenization → ageing → freezing → hardening; FSSAI standards for milk fat (minimum 10%), total solids (minimum 36%), and overrun; defects including sandiness (lactose crystallization), shrinkage, and iciness
• Part (a): Legal standards under FSSAI Regulation 2011 for ice-cream, medium-fat ice-cream, and frozen dessert; compositional requirements and labelling distinctions
• Part (b): Wet rendering (tank rendering) with temperatures 115-120°C, dry rendering (batch or continuous) at 120-150°C, and steam rendering methods; comparative efficiency and fat quality
• Part (b): Handling of fallen animal carcasses under Prevention of Cruelty to Animals (Slaughter House) Rules, 2001; biosecurity and environmental considerations in rendering
• Part (c): Canning steps: pre-cooking → filling → exhausting → sealing → processing (retorting at 121°C, 15 psi) → cooling; thermal processing calculations
• Part (c): Can defects: mechanical defects (dents, leaks), chemical defects (hydrogen swell, sulfur staining), and microbiological defects; causes and detection methods
• Integration: Linkage between these technologies and Indian livestock sector—AMUL's ice-cream production, organized rendering plants under Fertilizer (Control) Order, and military/institutional meat canning