UPSC Animal Husbandry & Veterinary Science 2022 — Paper I

The primary directive is 'explain' for part (a), though parts (b)-(e) require 'describe' and part (e) also requires 'define'. Allocate approximately 30 words per mark across five sub-parts: spend ~30 words on (a) explaining why digestibility trials surpass chemical analysis/protein efficiency methods; ~30 words on (b) covering nutritional, hormonal, and pathological factors affecting blood cell formation; ~30 words on (c) detailing the electro-ejaculator apparatus, procedure, and comparing merits (high sperm yield, usable in recalcitrant bulls) versus demerits (semen quality concerns, animal welfare issues); ~30 words on (d) covering significance (safety, management) and methods (chemical, hot iron, Barnes dehorner); and ~30 words on (e) defining inbreeding coefficient and detailing inbreeding depression, loss of heterosis, and phenotypic uniformity. Structure each part as: definition/key concept → mechanism/process → specific applications/merits-demerits → brief conclusion.

• (a) Digestibility trial: explains why it measures actual nutrient availability (TD, DCP, TDN) versus chemical composition; mentions superiority over proximate analysis and biological value methods; cites digestibility coefficients and factors affecting them
• (b) Hematopoiesis factors: nutritional (Fe, Cu, Co, B12, folate, protein), hormonal (erythropoietin, androgens, thyroxine), environmental (hypoxia, altitude), pathological (anemias, bone marrow disorders), and species differences
• (c) Electro-ejaculation: describes rectal probe with electrodes, voltage/current parameters, sequential stimulation; merits—useful in paraplegic/untamed bulls, high volume; demerits—urine contamination, thermal damage to sperm, welfare concerns, legislative restrictions
• (d) Dehorning: significance—prevent injury to handlers/herd mates, ease of transport, reduced feed space; methods—caustic paste (KOH/NaOH) in calves <2 weeks, hot iron, Barnes/guillotine dehorners, amputation saw; pain management considerations
• (e) Inbreeding: definition as mating of related individuals (F>0); genetic consequences—increased homozygosity, unmasking deleterious recessives, inbreeding depression (reduced fertility, viability, growth); phenotypic consequences—increased uniformity, prepotency, reduced genetic variation

The directive 'describe' demands detailed, systematic exposition of feed additives, ration formulation, and mineral disorders. Allocate approximately 40% of time/words to part (a) given its 20 marks, with 30% each to parts (b) and (c). Structure as: brief introduction defining feed additives and their importance → systematic body covering all three sub-parts with clear sub-headings → concluding synthesis on integrated nutrition management for livestock productivity.

• Part (a): Comprehensive classification of feed additives (antibiotics, probiotics, prebiotics, enzymes, buffers, antioxidants, pigments, etc.) with specific focus on probiotic mechanisms (competitive exclusion, immune modulation, enzyme production) and merits in ruminants and monogastrics
• Part (b): Step-wise least cost ration formulation for swine including nutrient requirements (NRC/ICAR standards), feed ingredient database with cost constraints, use of Pearson square or linear programming methods, and practical constraints in Indian conditions
• Part (c): Systematic description of mineral deficiency disorders categorized as macro-minerals (Ca, P, Mg, Na, K, Cl, S) and trace minerals (Fe, Cu, Zn, Mn, Co, Se, I) with specific clinical signs, species susceptibility, and Indian field conditions
• Integration of Indian context: mention of ICAR feeding standards, NDDB initiatives, regional mineral deficiency belts (e.g., selenium deficiency in Kumaon, fluorosis in Rajasthan), and commercial probiotic products used in Indian dairy industry
• Scientific precision in terminology: CFU counts for probiotics, DE/ME values for swine, ppm requirements for trace minerals, and biochemical basis of deficiency symptoms
• Economic and welfare dimensions: cost-benefit of probiotic use, impact of least cost formulation on feed efficiency (FCR), and production losses from mineral deficiencies in Indian livestock sector

The directive 'describe' requires detailed, systematic exposition of physiological mechanisms across all three parts. Allocate approximately 30% time/words to part (a) on avian chemoreceptors, 30% to part (b) on cardiac cycle events, and 40% to part (c) on sheep digestive organs given its higher mark weightage. Structure with brief introductions for each part, followed by systematic anatomical-physiological descriptions, and conclude with integrated physiological significance across respiratory, cardiovascular and digestive systems.

• Part (a): Location and classification of avian chemoreceptors (central vs peripheral); specific role of intra-pulmonary CO2 receptors, arterial chemoreceptors in domestic fowl; mechanism of hyperventilation response to hypoxia and hypercapnia
• Part (b): Sequential events of cardiac cycle including atrial systole, isovolumetric contraction, rapid ejection, reduced ejection, isovolumetric relaxation, rapid filling, reduced filling phases; pressure-volume relationships and valve dynamics
• Part (c): Rumen physiology including microbial fermentation, volatile fatty acid absorption, eructation mechanism; reticulum function in regurgitation and foreign body trapping; omasum water absorption and abomasum true gastric secretion; small and large intestine adaptations for cellulose digestion in ovines
• Comparative physiological integration: How respiratory regulation supports cardiac output and digestive efficiency in ruminants and avians
• Species-specific adaptations: Unidirectional airflow in avians affecting chemoreceptor distribution; four-compartment stomach evolutionary advantage in sheep; cardiac cycle variations across species

The directive 'describe' requires systematic, detailed exposition of phenomena, processes and methods 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 linking the three themes (behaviour, selection, extension), followed by clearly demarcated sections for each sub-part, and a concluding synthesis on how these elements integrate in sustainable livestock production.

• Part (a): Thermoregulatory behaviours including shade-seeking, wallowing, reduced activity, panting, postural changes (e.g., wing spreading in poultry), and altered feeding patterns; distinction between behavioural and physiological adjustments
• Part (a): Species-specific variations (cattle vs. buffaloes vs. small ruminants vs. poultry) and the concept of thermoneutral zone with relevance to Indian tropical conditions
• Part (b): Bases of selection—natural vs. artificial; within artificial: mass selection, pedigree/lineage selection, family selection, progeny testing, and contemporary methods (genomic selection, marker-assisted selection)
• Part (b): Selection criteria: production traits (milk yield, growth rate), functional traits (longevity, fertility, disease resistance), and their relative economic weights in Indian breeding programmes like progeny testing schemes for Murrah buffaloes
• Part (c): Extension methods: individual contact methods (farm visits, demonstrations), group methods (farmer field schools, group discussions, training camps), mass media (KVK radio/TV programmes, Krishi Vigyan Kendras, Kisan Call Centres)
• Part (c): Participatory approaches: Farmer Participatory Research (FPR), Participatory Rural Appraisal (PRA), and ICT-based innovations (mKisan, WhatsApp groups) suited to low-literacy rural contexts

The question demands descriptive answers across five sub-parts (a-e), each carrying 10 marks with ~150 words limit. Allocate approximately 30 words/3 minutes per sub-part, ensuring balanced coverage: for (a) detail feed formulation steps sequentially; for (b) categorize blood vessels by function; for (c) structure disaster strategies by pre/during/post phases; for (d) group breeds by region with habitat-milk trait linkage; for (e) trace Operation Flood chronologically with outcomes. Use bullet points for clarity within each part.

• (a) Broiler starter feed: nutrient requirements (CP 22-24%, ME 3200 kcal/kg), ingredient selection (maize, SBM, fish meal), stepwise formulation—specification → ingredient selection → calculation → mixing → pelleting → quality control
• (b) Blood vessels: arteries (oxygen transport, pressure maintenance), veins (return flow, valves), capillaries (exchange), portal systems (hepatic, hypophyseal), pulmonary vs systemic circulation
• (c) Disaster management: early warning systems, evacuation/shelter, fodder reserves, veterinary first aid, carcass disposal, disease surveillance, rehabilitation—citing NDMP 2019 or state examples
• (d) Indigenous milch breeds: Gir, Sahiwal, Red Sindhi, Tharparkar, Deoni, Hariana—habitat (Gujarat/Punjab/Rajasthan), heat tolerance, milk yield ranges (1500-2500 kg), disease resistance
• (e) Operation Flood: Phase I-III (1970-1996), NDDB role, Amul model, Anand pattern, milk production growth (17M to 70M tonnes), White Revolution impact, challenges post-1996

The directive 'describe' requires comprehensive, systematic exposition of facts with proper classification and detail. Allocate approximately 40% of time/words to part (a) given its 20 marks weightage, covering cellular constituents (spermatozoa morphology, abnormalities) and fluid fractions (seminal plasma, accessory gland secretions) across species. Devote ~30% each to parts (b) and (c): for (b) structure the answer around immediate postpartum care, uterine involution monitoring, metabolic disease prevention, and lactation initiation; for (c) divide gestation into early, mid, and late phases with flushing strategy, then suckling period nutrition with creep feeding considerations. Use species-specific examples (cattle, buffalo, sheep) and Indian farm contexts throughout.

• Part (a): Detailed morphology of spermatozoa (head, midpiece, tail) with species variations; classification of abnormalities (primary vs secondary); semen fractions (sperm-rich vs sperm-poor) and accessory gland contributions (seminal vesicles, prostate, bulbourethral glands)
• Part (a): Biochemical composition of seminal plasma (fructose, citric acid, ergothioneine, enzymes) and its functional significance for sperm metabolism, motility, and capacitation
• Part (b): Immediate postpartum management (placental expulsion, uterine involution tracking via rectal palpation/ultrasonography, lochial discharge monitoring) and early lactation metabolic challenges (parturient paresis, ketosis, mastitis prevention)
• Part (b): Transition cow nutrition strategy (negative energy balance management, calcium homeostasis, gradual concentrate introduction) and reproductive readiness assessment before first service
• Part (c): Gestation feeding phases in ewes—maintenance in early gestation, moderate gain in mid-gestation, and strategic flushing (0.5-0.75 kg concentrate/head/day) in last 4-6 weeks pre-lambing for optimal birth weight and colostrum production
• Part (c): Suckling period nutrition including lactation peak demands, body condition score maintenance (2.5-3.0), creep feeding initiation at 2-3 weeks for lambs, and flushing for early rebreeding in accelerated lambing systems

The directive 'describe' demands detailed, systematic exposition with clarity on processes and characteristics. Allocate approximately 30% time/words to part (a) on TDN, 40% to part (b) on protein quality being the highest-marked section, and 30% to part (c) on balanced ration for breeding bulls. Structure with clear sub-headings for each part, begin with definitions, proceed to elaboration of factors/methods/characteristics, and conclude with practical implications for livestock management in Indian conditions.

• Part (a): Precise definition of TDN as sum of digestible crude protein, crude fibre, nitrogen-free extract and 2.25 times digestible ether extract; factors affecting TDN including feed composition, processing methods, animal species and physiological state
• Part (a): Explanation of digestibility coefficients and how they vary with fibre content, lignification, and anti-nutritional factors; mention of TDN limitations for high-producing animals
• Part (b): Comprehensive listing of protein quality measures including PER, NPR, NPU, BV, chemical score, PDCAAS, and DIAAS for monogastrics
• Part (b): Detailed biological value method description including nitrogen balance studies, formula (BV = retained N/absorbed N × 100), experimental procedure with rats/poultry, and distinction between true BV and apparent BV
• Part (c): Definition of balanced ration meeting all nutrient requirements for maintenance and production; specific characteristics for breeding bulls including energy density, protein quality, mineral balance (Ca:P), vitamin A and E adequacy
• Part (c): Breeding bull-specific requirements: libido maintenance, semen quality parameters, body condition score maintenance, and avoidance of excess body fat; mention of ICAR feeding standards

The directive 'describe' requires detailed, systematic exposition of processes and relationships. Allocate approximately 30% time/words to part (a) on renal acidosis-hyperparathyroidism interrelationship, 30% to part (b) on adenohypophysis regulation pathways, and 40% to part (c) on growth factors given its higher mark weightage. Structure with brief introductions for each part, followed by mechanistic details, and conclude with integrated clinical or production relevance across all three sub-parts.

• Part (a): Pathophysiology of chronic nephritis leading to metabolic acidosis; phosphate retention and hypocalcemia; compensatory PTH hypersecretion; bone demineralization (renal osteodystrophy); vicious cycle of acidosis-parathyroid activation
• Part (b): Hypothalamic regulatory factors (releasing and inhibiting hormones); portal hypophyseal blood system; short-loop and long-loop negative feedback mechanisms; ultradian and circadian rhythms; neuroendocrine integration
• Part (c): Genetic factors (breed, sex, individual variability); nutritional factors (energy, protein, minerals, vitamins); environmental factors (temperature, photoperiod, altitude); hormonal regulation (GH, thyroid, insulin, sex steroids); pathological and management factors
• Integration: Comparative aspects across domestic species (canine, bovine, porcine) where relevant to demonstrate applied veterinary knowledge
• Clinical/production significance: Therapeutic implications for part (a), diagnostic relevance for part (b), and economic importance for part (c)