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Animal Husbandry & Veterinary Science 2025 Paper I 50 marks Discuss

Paper I — Q2

(a) Write about the methods to calculate energy requirements for the maintenance of animals. 15 (b) Discuss the effects of…

(a) Write about the methods to calculate energy requirements for the maintenance of animals. 15 (b) Discuss the effects of ionophores on rumen metabolism. 15 (c) Name the different constituents of blood and write about their functions. 10 (d) Discuss the role of hormones secreted by adrenal gland with special reference to the survival of animals. 10

हिंदी में प्रश्न पढ़ें

(a) पशुओं के निर्वाह (मैंटेनेंस) के लिए ऊर्जा की आवश्यकता की गणना करने की विधियों के बारे में लिखिए । 15 (b) रूमेन चयापचय पर आयनोफोर्स के प्रभावों की चर्चा कीजिए । 15 (c) रक्त के विभिन्न घटकों के नाम बताइए तथा उनके कार्यों के बारे में लिखिए । 10 (d) पशुओं के अस्तित्व के विशेष संदर्भ में अधिवृक्क ग्रंथि द्वारा स्रावित हार्मोनों की भूमिका पर चर्चा कीजिए । 10

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Directive word: Discuss

This question asks you to discuss. The directive word signals the depth of analysis expected, the structure of your answer, and the weight of evidence you must bring.

See our UPSC directive words guide for a full breakdown of how to respond to each command word.

How this answer will be evaluated

Approach

The directive 'discuss' requires critical examination with balanced coverage across all four sub-parts. Allocate approximately 35-40% time/words to part (a) given its 15 marks, 30% to part (b), and 15% each to parts (c) and (d). Structure with brief introductions for each sub-part, systematic body coverage, and integrated conclusions where analytical synthesis is possible.

Key points expected

  • Part (a): Methods for calculating maintenance energy including factorial method (NEm = Fasting metabolism + Activity allowance), comparative slaughter technique, and respiration calorimetry; reference to NRC/ICAR standards for Indian conditions
  • Part (b): Ionophores (monensin, lasalocid) effects on rumen fermentation: shift from acetate to propionate, reduced methane production, improved feed efficiency, and altered microbial population (Gram-positive inhibition)
  • Part (c): Blood constituents—plasma (water, proteins, electrolytes) and formed elements (RBCs, WBCs, platelets); functions including oxygen transport, immune defense, clotting, and acid-base balance
  • Part (d): Adrenal hormones—cortisol (gluconeogenesis, stress adaptation), aldosterone (Na+/K+ balance, blood pressure), adrenaline/noradrenaline (fight-flight, glycogenolysis); survival relevance during starvation, dehydration, and environmental stress
  • Integration: Comparative physiological adaptations across species (cattle vs. buffalo vs. small ruminants) relevant to Indian livestock production systems

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Demand-directive understanding20%10For (a) explains multiple calculation methodologies with their scientific basis; for (b) critically discusses both beneficial and adverse effects of ionophores; for (c) systematically categorizes blood constituents; for (d) explicitly links adrenal hormones to survival mechanisms under stress—demonstrating nuanced grasp of 'discuss' across all directive variantsCovers all parts superficially; treats (a) as list of formulas, (b) as description only, (c) as simple naming exercise, (d) as hormone listing without survival context—missing depth expected from 'discuss'Misinterprets directives—describes when asked to discuss, or confuses calculation methods with feeding standards; omits critical dimension entirely in one or more sub-parts
Content depth & accuracy20%10Precise equations for (a) like NEm (kcal) = 70 × BW^0.75; accurate biochemical pathways for ionophore action (Na+/H+ antiport); correct normal values for blood constituents; specific hormone receptors and HPA axis integration for (d)—all physiologically accurateGeneral correctness but imprecise—uses 'energy' loosely without specifying ME/NE/DE hierarchy; vague on ionophore mechanism; omits specific blood cell counts; describes adrenal hormones without receptor-level detailFundamental errors—confuses maintenance with production requirements; misidentifies ionophores as antibiotics or growth hormones; errors in blood composition (e.g., calling plasma a cell); hormonal actions reversed or confused
Structure & flow20%10Clear four-part architecture with visible sub-headings; logical progression within each part—(a) from principles to practical application, (b) from mechanism to outcome, (c) from plasma to formed elements, (d) from cortex to medulla with survival integration; smooth transitions between partsAll parts present but poorly demarcated; some internal organization within parts but inconsistent—(a) may jump between methods, (b) mixes mechanism with effects haphazardly; readable but requires effort to followNo visible structure—stream of consciousness mixing all four parts; or severely unbalanced with 60% on one part; missing sub-parts or incorrect sequencing that confuses examiner
Examples / case-law / data20%10ICAR (2013) feeding standards for Indian livestock in (a); specific ionophore trials (e.g., monensin in crossbred cattle) with percentage improvements in (b); normal physiological ranges for Indian breeds in (c); documented stress responses in working bullocks or high-altitude yaks for (d)Generic references without specificity—'NRC standards' without version, 'ionophores improve efficiency' without data, 'blood has many cells' without counts; no Indian context or breed-specific examplesNo quantitative data whatsoever; invented statistics; or irrelevant examples from human physiology that don't translate to veterinary context; complete absence of Indian research citations
Conclusion & analytical edge20%10Synthesizes across parts where possible—e.g., how precise energy calculation (a) enables optimal ionophore response (b), supported by healthy blood parameters (c) and stress-resistant endocrine function (d); forward-looking note on precision livestock farming integration; policy relevance for climate-resilient livestock productionSummarizes each part separately without cross-linking; restates main points without advancing synthesis; no forward-looking element or practical application to Indian animal husbandryNo conclusion or abrupt ending; or single generic conclusion ignoring all four parts; contradictory statements across sub-parts left unresolved

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