Paper I — Q6
(a) Describe the cellular and fluid constituents of semen in domestic animals. (20 marks) (b) Describe the scientific management…
(a) Describe the cellular and fluid constituents of semen in domestic animals. (20 marks) (b) Describe the scientific management of a dairy cow after parturition in a dairy farm. (15 marks) (c) Describe the feeding of ewe flock during gestation and suckling period. (15 marks)
हिंदी में प्रश्न पढ़ें
(a) पालतु पशुओं में वीर्य के कोशिकीय और द्रव घटकों का वर्णन कीजिए। (20 अंक) (b) डेयरी फार्म पर प्रसव के बाद डेयरी गाय के वैज्ञानिक प्रबंध का वर्णन कीजिए। (15 अंक) (c) गर्भावस्था और दूध पिलाने की अवधि में भेड़ के झुंड को खिलाने का वर्णन कीजिए। (15 अंक)
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 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.
Key points expected
- 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
Evaluation rubric
| Dimension | Weight | Max marks | Excellent | Average | Poor |
|---|---|---|---|---|---|
| Demand-directive understanding | 15% | 7.5 | Demonstrates precise grasp of 'describe' by providing systematic, layered exposition for all three parts—part (a) distinguishes cellular from fluid constituents with functional correlations; parts (b) and (c) present chronological/phase-wise descriptive frameworks rather than disjointed lists | Provides factual coverage for all parts but treats 'describe' as mere listing; misses functional interconnections in (a), lacks phase differentiation in (b) and (c), or conflates description with recommendation | Misinterprets directive as 'discuss' or 'evaluate' and provides argumentative content; or offers fragmented, incomplete descriptions with major omissions in one or more sub-parts |
| Content depth & accuracy | 30% | 15 | Exhibits command of quantitative parameters (sperm concentration 1-2 billion/ml in bulls, 0.5-1.5 billion/ml in rams; uterine involution 30-40 days in cattle; flushing energy increment 50% above maintenance) with correct anatomical-physiological terminology across all three domains | Covers major content areas with acceptable accuracy but lacks quantitative specificity, confuses accessory gland contributions, or provides generic rather than species-tailored management protocols | Contains significant factual errors (e.g., misidentifying semen fractions, confusing gestation phases, incorrect metabolic disease timelines) or superficial coverage that misses core technical content in any sub-part |
| Structure & flow | 20% | 10 | Presents clear tripartite organization with internal scaffolding: part (a) uses cellular/fluid binary with species comparative tables; part (b) follows chronology (0-24h → days 1-7 → weeks 2-6); part (c) separates gestation trimesters and suckling sub-phases with visual clarity | Addresses all parts with identifiable structure but shows uneven organization—strong on (a) but narrative-style on (b) and (c), or lacks explicit transitions between management phases | Poorly demarcated sub-parts with no internal organization; rambling presentation that forces examiner to hunt for relevant content; significant imbalance in length allocation relative to marks |
| Examples / case-law / data | 20% | 10 | Integrates Indian context throughout: NDRI Karnal semen preservation protocols for (a); ICAR-NDRI or state livestock farm postpartum management records for (b); CSWRI Avikanagar sheep nutrition recommendations or Maharashtra/shepherd cooperative flushing practices for (c); cites breed-specific data (Murrah, Malabari, Nellore, Garole) | Provides some Indian examples but inconsistently—strong on one sub-part, generic or absent on others; or relies on textbook Western data without adaptation to tropical Indian conditions | No Indian institutional, breed, or field examples; entirely derivative of foreign textbooks; or fabricates data/institutions that do not exist |
| Conclusion & analytical edge | 15% | 7.5 | Synthesizes across sub-parts to highlight reproductive efficiency as interconnected system—linking semen quality assessment (a) to fertility outcomes, postpartum recovery (b) to subsequent reproductive performance, and ewe nutrition (c) to lifetime productivity; offers forward-looking remarks on precision livestock farming applications | Provides perfunctory summaries for each sub-part without cross-linking; or offers generic concluding paragraph that restates main points without analytical elevation | No conclusion or abrupt termination; or introduces new factual content in conclusion that should have appeared in body; conclusion contradicts body content |
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