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Animal Husbandry & Veterinary Science 2021 Paper II 50 marks Discuss

Paper II — Q4

(a) Discuss the various methods of preservation of hides and skin. Elaborate the different steps involved in conversion of hides…

(a) Discuss the various methods of preservation of hides and skin. Elaborate the different steps involved in conversion of hides and skin into leather. (20 marks) (b) Discuss the different housing systems for poultry and their merits and demerits. (10 marks) (c) Discuss in detail the etiology, pathogenesis, symptoms, diagnosis and control of mastitis in a high-yielding crossbred Jersey cow. (20 marks)

हिंदी में प्रश्न पढ़ें

(a) खाल एवं त्वचा के संरक्षण के विभिन्न तरीकों की चर्चा कीजिए। खाल एवं त्वचा को चमड़े में बदलने में शामिल विभिन्न चरणों का विस्तार से वर्णन कीजिए। (20 अंक) (b) कुक्कुट (पोल्ट्री) पालन के लिए विभिन्न आवास व्यवस्थाओं (प्रणालियों) का वर्णन कीजिए और उनके गुण व दोषों पर चर्चा कीजिए। (10 अंक) (c) अधिक उत्पादकता (दुध) वाली क्रॉसब्रीड जर्सी गायों में थनैला (मास्टाइटिस) की इटियोलॉजी, रोगजनन, लक्षण, निदान और नियंत्रण के बारे में विस्तार से चर्चा कीजिए। (20 अंक)

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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 comprehensive coverage with critical elaboration across all three parts. Allocate approximately 40% of word budget to part (a) given its 20 marks, 20% to part (b), and 40% to part (c). Structure as: brief introduction acknowledging the three distinct domains (leather technology, poultry management, dairy pathology); then systematic treatment of each sub-part with clear sub-headings; conclude with integrated insights on livestock-based value chains and One Health approach.

Key points expected

  • Part (a): Preservation methods of hides/skins (drying, salting, brining, chilling, chemical preservatives) and complete leather processing sequence (curing → soaking → liming → deliming → bating → pickling → tanning → neutralising → fatliquoring → finishing)
  • Part (a): Distinction between vegetable tanning (saddle leather) vs chrome tanning (soft leather) with Indian context (Kolhapuris, Kanpur leather industry)
  • Part (b): Housing systems comparison—deep litter, cage system, slatted/wire floor, free-range/organic; merits/demerits on bird welfare, biosecurity, egg quality, labour and capital intensity
  • Part (c): Etiology of mastitis (contagious: Staphylococcus aureus, Streptococcus agalactiae; environmental: E. coli, Streptococcus uberis, Klebsiella) with specific reference to crossbred Jersey susceptibility
  • Part (c): Complete clinical picture—subclinical (elevated SCC, reduced milk yield), clinical (watery milk, flakes, udder swelling), chronic (fibrosis); diagnostic tools (CMT, SCC, bacterial culture, PCR); five-point control plan (teat dipping, dry cow therapy, culling, milking machine maintenance, vaccination)
  • Part (c): Economic impact on Indian dairy sector and relevance to Operation Flood legacy and current NDDB programmes

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Demand-directive understanding20%10Demonstrates nuanced grasp of 'discuss' and 'elaborate' by presenting balanced arguments, not mere lists; for (a) critically compares preservation methods' suitability for Indian conditions; for (b) evaluates trade-offs between intensive and extensive systems; for (c) integrates pathogenesis with practical control in high-yielding crossbredsAddresses all parts but treats 'discuss' descriptively; lists methods/systems/symptoms without critical evaluation; misses interconnections between etiology and control measuresMisinterprets directive as 'enumerate' or 'list'; omits elaboration entirely; fails to distinguish between sub-parts or confuses leather preservation with leather processing steps
Content depth & accuracy20%10Precise technical terminology throughout: for (a) specifies osmotic pressure in salting, collagen triple-helix stabilization in tanning; for (b) quantifies stocking densities (birds/m²) and ventilation rates; for (c) accurate SCC thresholds (>200,000 cells/ml), antibiotic protocols (5-day therapy vs 2-day), and distinguishes between contagious vs environmental pathogen controlGenerally accurate but lacks specificity—vague on chemical processes, omits numerical standards for housing, conflates acute and chronic mastitis signs; minor errors in pathogen classificationSignificant factual errors: confuses hide curing with tanning; describes battery cages as 'welfare-friendly'; attributes mastitis to viruses or lists incorrect diagnostic methods; demonstrates fundamental knowledge gaps
Structure & flow20%10Clear tripartite architecture with explicit (a)/(b)/(c) demarcation; within each part, logical progression (preservation before processing; housing types before merits/demerits; etiology → pathogenesis → symptoms → diagnosis → control); effective signposting and transitional phrases linking livestock sectors to integrated animal husbandryAll parts present but poorly demarcated; some internal logic (e.g., symptoms before diagnosis in mastitis) but weak transitions; conclusion generic or absent; occasional repetition between preservation and processing sectionsDisorganised or incomplete structure; missing sub-parts; random sequencing (e.g., control before etiology); no paragraph breaks or headings; illegible handwriting or excessive strikethroughs affecting evaluation
Examples / case-law / data20%10Rich Indian contextualisation: for (a) references Kanpur tannery cluster, Tamil Nadu leather exports, or Central Leather Research Institute (CLRI) innovations; for (b) cites Namakkal egg production zone, Venkateshwara Hatcheries, or NABARD poultry schemes; for (c) invokes NDDCB mastitis control network, Kerala's 'Mastitis Free Village' programme, or ICAR-CIRB research on crossbred susceptibilitySparse or generic examples—mentions 'India' without specifics; cites common knowledge (e.g., 'poultry is important in Andhra Pradesh') without data; no institutional or programme referencesNo Indian examples; irrelevant international cases dominating; or completely fabricated data; demonstrates disconnect from contemporary livestock sector developments
Conclusion & analytical edge20%10Synthesises three disparate domains into coherent livestock value chain analysis—links leather quality to hide preservation at slaughter, poultry housing to zoonotic disease emergence, and mastitis control to dairy profitability and food security; offers forward-looking recommendations (biosecurity integration, precision livestock farming, One Health policy); acknowledges sustainability challengesBrief summary restating main points without synthesis; standard concluding phrases ('thus we see...'); no policy recommendations or future directions; misses opportunity to connect sub-partsAbsent or abrupt conclusion; introduces new, unelaborated claims at end; or concludes with irrelevant personal opinion; demonstrates failure to grasp integrated nature of animal husbandry discipline

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