UPSC Animal Husbandry & Veterinary Science 2025 — Paper II

The directive 'discuss' requires a comprehensive yet concise treatment of all five sub-parts with balanced coverage. Allocate approximately 30 words per mark (150 words × 5 parts = 750 total). Structure each sub-part as: brief introduction → core content → key takeaway. For part (a), prioritize epithelial, connective, muscular and nervous tissue features; (b) emphasize topographical anatomy; (c) classify diuretics and fluid replacers; (d) cover pollution types then focus on water quality parameters; (e) detail cold-chain protocols for rabies diagnosis. Maintain strict word discipline—exceeding 150 words in any part invites penalty.

• (a) Histological features: epithelial (simple/stratified, squamous/columnar/cuboidal with basement membrane), connective (matrix composition, fiber types, cell types), muscular (striated vs. smooth, sarcomere structure), nervous (neurons with Nissl bodies, neuroglia)
• (b) Superficial lymph nodes of ox: parotid (caudal to mandible), mandibular (intermandibular space), prescapular (shoulder), prefemoral (stifle), popliteal (hock), supramammary (udder)—with drainage areas
• (c) Drugs on fluid balance: diuretics (loop, thiazide, potassium-sparing, osmotic), antidiuretics (ADH, desmopressin), fluid replacers (crystalloids, colloids, hypertonic saline), electrolyte solutions
• (d) Pollution types (air, water, soil, noise, thermal); water pollution sources (point—industrial effluents, sewage; non-point—agricultural runoff); signs (algal blooms, BOD rise, fish kills); quality measurement: physicochemical (pH, DO, BOD, COD, TDS, heavy metals), biological (MPN, plankton indices), WQI calculation
• (e) Rabies sample collection: brain tissue (hippocampus, cerebellum, brainstem) via occipital foramen or sawing; preservation in 50% glycerol-saline or formalin for histopathology; cold chain maintenance; triple packaging; IVC rules compliance; information on Form 1

The directive 'explain' requires clear causal reasoning and step-by-step exposition. For part (a) (20 marks), allocate ~40% time/words to describe chorion, amnion, allantois and yolk sac formation with labelled diagrams; for part (b) (20 marks), spend ~35% on ideal properties (selective toxicity, spectrum, pharmacokinetics) followed by systematic classification; for part (c) (10 marks), reserve ~25% for comparative housing specifications. Structure: brief introduction → systematic part-wise treatment → integrated conclusion linking reproductive physiology, therapeutics and management.

• Part (a): Chronological development of foetal membranes from trophoblast differentiation; structure and functions of chorion (villous types), amnion (amniotic fluid dynamics), allantois (vascularization and urine storage), and yolk sac (haematopoiesis); species variations (diffuse, cotyledonary, zonary, discoidal placentation); diagrammatic representation with proper labelling
• Part (b): Ideal antimicrobial properties—selective toxicity, appropriate spectrum, favourable pharmacokinetics (ADME), stability, solubility, cost-effectiveness and resistance prevention; classification by mechanism (cell wall synthesis inhibitors, protein synthesis inhibitors, nucleic acid synthesis inhibitors, antimetabolites) and by spectrum (narrow, broad, extended)
• Part (b) continued: Specific examples—β-lactams, aminoglycosides, fluoroquinolones, sulphonamides; mention of WHO AWaRe classification relevance in Indian veterinary context
• Part (c): Housing for pregnant cows—individual calving pens (3.6m × 3.6m), loose housing with adequate lying space (3.5-4 sq.m/cow), non-slip flooring, ventilation (8-10 air changes/hour), isolation from milking herd; Housing for milking cows—tie-stall vs loose housing systems, milking parlour proximity, feed bunk space (60-70 cm/cow), heat stress management in tropical climates
• Part (c) continued: Biosecurity integration—foot baths, clean dry lying surfaces, transition cow management; reference to BIS/ICAR standards or NDDB dairy herd improvement protocols

The directive 'elucidate' in part (a)(i) demands clear, comprehensive explanation with causal linkages, while 'explain' in (a)(ii) and (c) requires reasoned exposition, and 'discuss' in (b) calls for detailed examination. Allocate approximately 20 minutes/400 words to part (a) combined (10+10 marks), 15 minutes/300 words to part (b) combined (8+7 marks), and 25 minutes/500 words to part (c) (15 marks) with priority to accurate, labelled diagrams. Structure each sub-part with brief introduction, systematic body addressing all components, and concluding synthesis where marks permit.

• For (a)(i): Etiology of esophagitis (traumatic, chemical, infectious including Actinobacillus lignieresii); pathogenesis (mucosal injury → inflammation → ulceration/necrosis); clinical findings (dysphagia, regurgitation, salivation, pain on palpation, cervical swelling); treatment (antibiotics, NSAIDs, soft diet, surgical drainage if abscess)
• For (a)(ii): Iodine's role in thyroid hormone synthesis (T3/T4); deficiency manifestations (goitre, reproductive failure, retained placenta, weak/premature offspring, hair coat abnormalities); supplementation rationale (soil-iodine deficiency in Himalayan/Goiter Belt regions, preventive dosing)
• For (b)(i): Femur fracture repair in adult Murrah buffalo—approach (lateral incision), reduction technique, fixation methods (intramedullary pinning, plating, external skeletal fixation), post-operative care including weight management and restricted movement
• For (b)(ii): Non-union factors—biological (poor blood supply, infection, inadequate immobilization), mechanical (excessive gap, instability), patient-related (age, nutritional status, metabolic disease), and iatrogenic causes
• For (c): Ovary gross anatomy—small, irregular body with no definite cortex-medulla demarcation, absence of corpus luteum graviditatis, hierarchical follicles; Oviduct—infundibulum with funnel and fimbriae, magnum (albumen secretion), isthmus (shell membrane), uterus (shell formation), vagina; accurate labelled diagrams essential

The directive 'explain' requires clear, logical exposition of mechanisms and processes with cause-effect linkages. Allocate approximately 20% time/words to (a)(i) Avian Influenza [10 marks], 20% to (a)(ii) Acetonaemia [10 marks], 30% to (b) Stay apparatus [15 marks], and 30% to (c) Neurological diseases [15 marks]. Structure: brief introduction highlighting interconnectedness of metabolic, infectious and anatomical disorders; systematic body addressing each sub-part with diagrams for (b); conclusion emphasizing One Health approach and preventive veterinary medicine.

• For (a)(i): Economic impact of AIV (trade bans, culling costs, egg/meat production losses); biosecurity measures, stamping-out policy, vaccination strategies; WHO Pandemic Influenza Preparedness Framework and IHR 2005
• For (a)(ii): Negative energy balance, ketone body metabolism, high genetic merit, stress factors; acetone breath, nervous signs, hypoglycemia; milk ketone tests, calcium status; glucose therapy, propylene glycol, corticosteroids
• For (b): Reciprocal apparatus (patellar ligaments, check ligaments, stay apparatus of forelimb and hindlimb); passive stay mechanism enabling standing sleep; Bow and String theory (thoracolumbar fascia as bow, abdominal muscles as string) maintaining trunk rigidity
• For (c): Altered mentation, seizures, cranial nerve deficits, ataxia, paresis/paralysis, proprioceptive deficits; neurological examination: menace response, pupillary light reflex, palpebral reflex, gag reflex, limb proprioception, spinal reflexes, CSF analysis, advanced imaging
• Integration: Comparative aspects across species (horse vs ruminant vs poultry) and preventive veterinary medicine principles
• Current Indian context: H5N1/H9N2 outbreaks in Kerala/West Bengal; NDDB protocols; buffalo production systems in Indo-Gangetic plains

The directive 'discuss' requires presenting key facts with analytical depth across all five sub-parts. Allocate approximately 30 words (20% time) per sub-part given equal 10-mark weighting, ensuring balanced coverage: (a) outline OIE's five-step standard setting from expert consultation to WTO SPS recognition; (b) explain neutralization purpose and alkali treatment; (c) contrast mesophilic Acidophilus milk with thermophilic Bulgarian buttermilk processing; (d) distinguish chilling vs freezing principles; (e) specify carpet wool grading parameters. Conclude each part with significance or application.

• (a) OIE standard setting: expert group formation, draft preparation, member country consultation, adoption by World Assembly, publication in Terrestrial/Aquatic Code, and WTO SPS agreement recognition
• (b) Cream neutralization: purpose (reduce acidity for butter quality), alkali used (NaHCO₃, Na₂CO₃, Ca(OH)₂), determination of neutralizer quantity, and impact on butter yield and keeping quality
• (c) Acidophilus milk: Lactobacillus acidophilus, 37°C for 18-24 hours, therapeutic milk; Bulgarian buttermilk: L. delbrueckii subsp. bulgaricus, 40-43°C, higher acidity, traditional fermentation
• (d) Low temperature preservation: principle (reduced microbial/enzymatic activity), chilling (0-4°C, short term), freezing (-18 to -40°C, ice crystal formation, thaw drip, cold shortening prevention)
• (e) Carpet wool grading: objective measurements (fiber diameter, medullation percentage, staple length, color), Indian carpet wool breeds (Malpura, Jaisalmeri, Magra), BIS/ISI standards, hand vs machine sorting

The directive 'discuss' requires a comprehensive, analytical treatment across all three sub-parts. Allocate approximately 20% of time/words to (a)(i) emerging zoonotic diseases (10 marks), 20% to (a)(ii) transmission and control (10 marks), 30% to (b) milk defects in condensed/evaporated milk (15 marks), and 30% to (c) ante-mortem inspection (15 marks). Structure with brief introductions for each sub-part, systematic body coverage of all components, and integrated conclusions highlighting One Health linkages between zoonotic disease control and food safety.

• (a)(i) Emerging zoonoses: Definition, drivers (deforestation, climate change, wildlife trade), specific examples (Nipah, COVID-19, Avian Influenza H5N1, CCHF), prevalence patterns in India (Kyasanur Forest Disease in Karnataka, Nipah in Kerala), economic and public health impacts
• (a)(ii) Transmission methods: Direct contact, vector-borne, food-borne, airborne, fomite; vertical vs horizontal; Control measures: Biosecurity, vaccination, quarantine, culling with compensation, surveillance (NADRS), international frameworks (WOAH, WHO One Health)
• (b) Condensed/evaporated milk defects: Age gelation, fat separation, Maillard browning, bacterial contamination (thermophilic sporeformers), tin contamination; Causes: pre-heating conditions, storage temperature, metal corrosion, inadequate sterilization; Prevention: optimized forewarming, aseptic packaging, lacquered cans, cold storage
• (c) Ante-mortem inspection: Purpose (disease detection, food safety, humane slaughter), procedure (resting, identification, clinical examination, temperature recording); Categorization: Fit for slaughter, unfit/suspect (condemned), emergency slaughter, detained for further examination (as per FSSAI and Prevention of Cruelty to Animals Rules)
• Integration: Link zoonotic disease surveillance with ante-mortem protocols; connect milk processing safety to overall veterinary public health framework

The question demands descriptive treatment across all three parts, with 'describe' as the primary directive for parts (b) and (c), while (a)(i) requires detailed exposition and (a)(ii) demands discussion. Allocate approximately 20% (400-500 words) to part (a) covering both sub-sections equally, 35% (700-800 words) to part (b) as the highest-mark component requiring technical process details, and 30% (600-700 words) to part (c) for FSSAI standards. Structure with clear sub-headings for each part, use tabular formats for standards and defects, and conclude with integrated food safety implications across all three domains.

• Part (a)(i): Milk-borne diseases (tuberculosis, brucellosis, Q-fever, listeriosis, salmonellosis, staphylococcal intoxication) and meat-borne diseases (taeniasis, trichinellosis, toxoplasmosis, sarcocystosis, CJD/BSE) with specific control measures including pasteurization standards, meat inspection protocols, and HACCP application
• Part (a)(ii): Vetro-legal framework for sudden death covering Section 429 IPC, Prevention of Cruelty to Animals Act 1960, Indian Evidence Act 1872 (Section 45 expert opinion), role of veterinary forensic expert in post-mortem, sample preservation for toxicological analysis, and chain of custody documentation
• Part (b): Mother starter preparation (lyophilized culture → sterilized reconstituted skim milk → incubation at 21-24°C for 14-16 hours → pH 4.5-4.6 → storage at 4°C) and bulk starter propagation (1-2% inoculum → larger volumes → controlled fermentation); defects including slow acid production, bitterness, whey separation, off-flavors, and contamination by yeasts/molds/bacteriophages
• Part (b) continued: Preventive measures for starter defects including culture purity maintenance, aseptic techniques, phage-resistant strains, proper incubation temperature control, and use of reconstituted NFDM with proper heat treatment
• Part (c): FSSAI standards for fresh chicken eggs (FSSAI Regulation 2.2.1 of Food Safety and Standards Regulations 2011) covering weight grades, shell quality, Haugh unit, yolk index, air cell size, and microbial limits; frozen egg products standards for pasteurization requirements, solids content, and bacterial counts
• Part (c) continued: Whole egg powder standards (FSSAI 2.2.3) specifying moisture maximum 5%, fat minimum 42%, solubility index, bacterial plate count, Salmonella absence, and packaging requirements; comparison across fresh, frozen, and dried forms for shelf-life and safety parameters

The directive 'discuss' requires critical examination with balanced coverage across all sub-parts. Allocate approximately 40% of time/words to part (a) [20 marks], 30% to part (b) [15 marks], and 30% to part (c) [15 marks]. Structure with brief introductions for each sub-part, systematic body addressing all components, and integrated conclusions highlighting linkages between meat processing, waste management, and dairy by-product utilization.

• Part (a)(i): Modern meat processing technologies—HPP (High Pressure Processing), PEF (Pulsed Electric Field), cold plasma, ultrasound, smart packaging indicators, and hurdle technology for quality enhancement
• Part (a)(ii): Traditional packaging (wax paper, banana leaves, earthen pots) versus modern packaging (MAP, vacuum packaging, active/intelligent packaging, edible films, bioplastics) with marketing implications
• Part (b)(i): Abattoir effluent characteristics (BOD, COD, TSS), primary/secondary/tertiary treatment, anaerobic digesters, DAF (Dissolved Air Flotation), constructed wetlands, and compliance with EPA standards
• Part (b)(ii): Condemned carcass processing—rendering methods (batch vs continuous), sterilization requirements, meat-cum-bone meal (MBM) specifications, BSE regulations, and alternative uses (pet food, fertilizer)
• Part (c): Industrial casein classification (acid, rennet, coprecipitated), acid casein manufacture—pH adjustment (4.5-4.7), washing, pressing, drying, grinding, and quality parameters (moisture, ash, protein content)
• Integration: Linkages between waste minimization (b), value addition (c), and quality assurance (a) in integrated meat and dairy processing industries