Animal Husbandry & Veterinary Science 2023 Paper I 50 marks Describe
Paper I — Q2
(a) Describe the methods for evaluation of protein quality in ruminant animals. (20 marks) (b) Enlist the hormones secreted from…
(a) Describe the methods for evaluation of protein quality in ruminant animals. (20 marks) (b) Enlist the hormones secreted from anterior pituitary gland and describe the physiological role of these hormones. (5+10=15 marks) (c) Describe the nutritional factors affecting the composition of milk in dairy cows. (15 marks)
हिंदी में प्रश्न पढ़ें
(a) जुगाली करने वाले पशुओं में प्रोटीन गुणवत्ता के मूल्यांकन की विधियों का वर्णन कीजिए । (20) (b) अग्र पीयूष ग्रंथि से स्रावित हार्मोनों को सूचीबद्ध कीजिए और इन हार्मोनों की कार्यिकीय भूमिका का वर्णन कीजिए । (5+10=15) (c) डेयरी गायों में दूध की संरचना को प्रभावित करने वाले पोषक कारकों का वर्णन कीजिए । (15)
Directive word: Describe
This question asks you to describe. 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 'describe' requires detailed, systematic exposition of methods, hormones, and nutritional factors with appropriate elaboration. Allocate approximately 40% of time/words to part (a) given its 20 marks weightage, 30% each to parts (b) and (c). Structure with brief introductions for each sub-part, followed by systematic description of methods/hormones/factors, and conclude with integrated insights on how protein quality, endocrine regulation, and nutrition collectively optimize dairy production.
Key points expected
- Part (a): Biological value (BV), Protein efficiency ratio (PER), Net protein utilization (NPU), Digestible crude protein (DCP), Rumen degradable protein (RDP) vs undegradable protein (UDP) systems, PDI/ADI systems for ruminants
- Part (a): In vitro methods (Daisy incubator, nylon bag technique), In situ rumen degradation studies, Amino acid scoring pattern for ruminants, Metabolizable protein (MP) concept as per NRC/ICAR standards
- Part (b): Complete enumeration of anterior pituitary hormones (GH, TSH, ACTH, FSH, LH, Prolactin, MSH) with their target organs and primary physiological actions in domestic animals
- Part (b): Specific roles: GH on mammary development and lactation; Prolactin on milk synthesis and maternal behavior; Gonadotropins on ovarian cyclicity and spermatogenesis
- Part (c): Energy intake and balance effects on milk fat (low fiber/high concentrate causing low fat syndrome); Protein/amino acid adequacy for milk protein synthesis
- Part (c): Specific nutrients: dietary fat supplements (protected fat) on milk fat %; mineral deficiencies (Cu, Zn, Se) on milk composition; water intake effects; seasonal/heat stress impacts on solids-not-fat
- Part (c): Feeding strategy examples: Total Mixed Ration (TMR) formulation, bypass protein usage, and their measurable effects on milk constituents in Indian dairy breeds (Sahiwal, Murrah)
Evaluation rubric
| Dimension | Weight | Max marks | Excellent | Average | Poor |
|---|---|---|---|---|---|
| Demand-directive understanding | 18% | 9 | Demonstrates precise understanding of 'describe' across all three parts: for (a) provides procedural details of evaluation methods with steps and applicability; for (b) lists all seven anterior pituitary hormones before describing physiological roles with mechanism; for (c) systematically covers nutritional factors with cause-effect relationships on milk constituents | Provides basic descriptions but confuses 'describe' with mere listing in part (b), or gives superficial coverage of methods in (a) without procedural steps; nutritional factors in (c) lack specificity on which milk component is affected | Misinterprets directive—enumerates without describing (especially in b), or confuses anterior vs posterior pituitary; treats (a) as 'define' giving only terminology without evaluation methodology |
| Content depth & accuracy | 24% | 12 | For (a): accurate equations for BV, PER, NPU; distinguishes ruminant-specific MP system from monogastric methods; cites ICAR/NRC 2021 updates. For (b): correct hypothalamic-pituitary axis relationships; precise target organs and feedback mechanisms. For (c): accurate biochemical pathways (acetate for de novo fatty acid synthesis; glucose for lactose) | Covers major methods and hormones but with technical errors (e.g., confuses RDP with UDP calculations, omits prolactin's role in lactation maintenance, or states general feed effects without specifying milk component changes) | Major factual errors: uses monogastric protein quality methods for ruminants without modification; includes posterior pituitary hormones in (b); confuses nutritional factors with environmental factors in (c); incorrect biochemical pathways |
| Structure & flow | 18% | 9 | Clear three-part architecture with visible sub-headings; within (a) logical progression from in vivo → in vitro → systems-based evaluation; within (b) enumeration followed by systematic role-description; within (c) grouping by nutrient category (energy/protein/minerals) with clear impact mapping; smooth transitions between parts | All three parts present but poorly demarcated; methods in (a) presented as disconnected list; hormones in (b) described without initial enumeration; nutritional factors in (c) randomly ordered without categorization; missing or abrupt transitions | No visible structure—parts merged or indistinguishable; illogical sequencing (e.g., mixing anterior and posterior pituitary); no paragraph breaks; answer appears as continuous prose without organizational markers |
| Examples / case-law / data | 20% | 10 | For (a): cites specific BV values for common Indian feedstuffs (groundnut cake 55-60, mustard cake 45-50); mentions NDRI/IVRI research on nylon bag technique. For (b): breed-specific examples (prolactin surge in Murrah buffalo post-partum; GH effects on crossbred cattle growth). For (c): quantitative data on milk composition changes (2-3% fat reduction with low-fiber diet; 0.3-0.5% protein increase with bypass protein supplementation) | Generic examples without specificity; mentions 'cattle' and 'buffalo' without breed distinction; states 'high concentrate reduces fat' without percentage data; no institutional research citations | No examples or data whatsoever; or irrelevant examples from non-ruminant species; fabricated statistics; confuses international research findings with Indian conditions without adaptation |
| Conclusion & analytical edge | 20% | 10 | Synthesizes across all three parts: shows how protein quality evaluation (a) informs ration formulation that, through nutritional manipulation (c), modulates endocrine profiles (b) especially prolactin/GH for optimized milk output; mentions precision livestock farming integration; suggests future research directions (metabolomics for protein quality, hormone profiling for production efficiency) | Brief concluding paragraph summarizing each part separately without integration; no forward-looking element; restates main points without analytical synthesis | No conclusion; or abrupt ending with last sub-part (c); or generic unrelated conclusion on animal husbandry development; missing synthesis between endocrine regulation, nutrition, and protein evaluation |
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