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Animal Husbandry & Veterinary Science 2021 Paper I 50 marks Describe

Paper I — Q4

(a) Differentiate between the following: (i) Endocrine and Exocrine glands. (4 marks) (ii) Phytobiotics and Xenobiotics. (4…

(a) Differentiate between the following: (i) Endocrine and Exocrine glands. (4 marks) (ii) Phytobiotics and Xenobiotics. (4 marks) (iii) Heart sound and heart beat. (4 marks) (iv) Normal and abnormal constituents of urine. (4 marks) (v) Pre-natal and post-natal growth. (4 marks) (b) Describe in detail about preparation of silage along with its advantages and disadvantages. (15 marks) (c) Define essential, critical and limiting amino acids. Enlist the factors affecting amino acids requirement in poultry. (5+10 marks)

हिंदी में प्रश्न पढ़ें

(a) निम्नलिखित के बीच विभेदन कीजिये : (i) अन्तःस्रावी एवं बाह्यस्रावी ग्रन्थियाँ । (4 अंक) (ii) पादपजीवी एवं जीनोबायोटिक्स । (4 अंक) (iii) हृदयध्वनि एवं हृदय धड़कन । (4 अंक) (iv) मूत्र के सामान्य व असामान्य घटक । (4 अंक) (v) प्रसवपूर्व व प्रसवोत्तर विकास । (4 अंक) (b) साइलेज बनाने की विधि को उसके फायदे और नुकसान सहित विस्तार से वर्णन कीजिये । (15 अंक) (c) अनिवार्य, क्रांतिक (महत्वपूर्ण) एवं सीमित अमीनो अम्ल को परिभाषित कीजिये । पक्षियों में अमीनो अम्ल की आवश्यकता को प्रभावित करने वाले कारकों को सूचीबद्ध कीजिये । (5+10 अंक)

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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 question demands descriptive treatment across multiple directive types: differentiate for (a), describe for (b), and define/enlist for (c). Allocate approximately 40% effort to part (b) silage technology (15 marks), 40% to part (a) differentiation items (20 marks total), and 20% to part (c) amino acid nutrition (15 marks). Structure with clear sub-headings for each part, use tabular format for differentiations in (a), and ensure technical precision in physiological definitions.

Key points expected

  • (a)(i) Endocrine vs Exocrine: secretion mode (ductless vs ducted), target (blood vs surface/cavity), examples (pituitary vs pancreas exocrine portion, salivary glands)
  • (a)(ii) Phytobiotics vs Xenobiotics: origin (plant-derived bioactive vs foreign chemical), function (growth promotion/immunity vs metabolic burden/detoxification), examples (essential oils, tannins vs drugs, pesticides)
  • (a)(iii) Heart sound vs Heart beat: nature (audible vibration vs mechanical contraction), causation (valve closure vs SA node impulse), frequency (lub-dub vs rate per minute)
  • (a)(iv) Normal vs Abnormal urine constituents: urea, creatinine, uric acid, electrolytes vs glucose, protein, ketone bodies, blood, casts, bilirubin indicating pathology
  • (a)(v) Pre-natal vs Post-natal growth: period (conception to birth vs birth to maturity), growth pattern (hyperplastic/hypertrophic vs compensatory), influencing factors (maternal vs environmental/nutritional)
  • (b) Silage preparation: crop selection (30-35% DM), wilting, chopping (1-3 cm), filling, compaction, sealing, anaerobic fermentation (LAB, pH drop to 4.0-4.5), types (bunker, tower, bag, pit); advantages (year-round feed, nutrient preservation, drought insurance) and disadvantages (initial cost, spoilage risk, mycotoxin potential)
  • (c) Essential amino acids (cannot be synthesized, must be supplied), critical amino acids (most limiting in specific physiological state), limiting amino acids (first to become deficient, restricts protein synthesis); factors affecting poultry AA requirement: genetic strain, age/physiological stage, environmental temperature, disease status, nutrient interactions, anti-nutritional factors, production goal (meat vs egg)

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Demand-directive understanding15%7.5Correctly identifies and executes all three directive types: uses tabular comparative format for (a) differentiations, provides process-oriented sequential description for (b) silage preparation, and gives precise technical definitions followed by enumerated factors for (c); no directive confusion or format mismatchGenerally follows directives but with some format inconsistency (e.g., prose instead of tables for differentiations, or lists instead of detailed description for silage); minor directive misinterpretation in one sub-partFundamental misunderstanding of directives—treats 'differentiate' as simple listing, 'describe' as brief definition, or 'enlist' as narrative; same approach applied uniformly across all sub-parts regardless of directive
Content depth & accuracy25%12.5Demonstrates command across veterinary physiology (endocrine/exocrine classification, cardiac physiology, renal function), applied nutrition (phytobiotics mechanisms, amino acid biochemistry), and fodder technology (fermentation biochemistry, silage microbiology); accurate pH values, microbial species (Lactobacillus, Enterobacter), and species-specific poultry amino acid dataCovers most content areas with acceptable accuracy but lacks biochemical specificity (e.g., mentions 'fermentation' without pH targets or bacterial succession); minor errors in physiological mechanisms (e.g., confuses heart sounds with murmurs)Significant factual errors (e.g., exocrine glands described as ductless, silage equated with hay, essential amino acids confused with non-essential); superficial coverage with textbook repetition lacking applied understanding
Structure & flow20%10Clear hierarchical organization with labeled sub-parts (a)(i)-(v), (b), (c); consistent use of tables for all five differentiations in (a), systematic step-wise presentation for silage preparation in (b), and definition-to-application progression in (c); smooth transitions between distinct knowledge domainsIdentifiable structure with sub-headings but inconsistent formatting (some differentiations tabular, others narrative); silage description present but steps not clearly sequenced; readable but requires examiner effort to followDisorganized response with mixed content, no clear part separation, random paragraph structure; examiner cannot distinguish where (a) ends and (b) begins; illegible or confusing presentation
Examples / case-law / data20%10Provides specific, context-appropriate examples: endocrine glands (pituitary, thyroid, adrenal) vs exocrine (pancreas acinar cells, salivary, mammary); phytobiotics (oregano oil, saponins) vs xenobiotics (aflatoxins, antibiotic residues); Indian silage practices (maize/sorghum fodder, NDRI Karnal technologies); poultry amino acid studies (ICAR layer/broiler strain requirements)Generic examples without specificity (e.g., 'hormones' without naming, 'plants' without species); Indian context absent; examples technically correct but not enhancing answer qualityNo examples or irrelevant/incorrect examples (e.g., 'kidney as exocrine gland'); complete absence of applied context or research institution references where expected
Conclusion & analytical edge20%10Synthesizes across sub-parts to show integrative understanding—links silage fermentation microbiology to rumen physiology, connects amino acid limitation to precision livestock farming; evaluates trade-offs (silage vs haylage, synthetic vs natural growth promoters); projects future relevance (climate-resilient fodder security, reduced antibiotic dependence through phytobiotics)Brief concluding statements per sub-part without cross-integration; no critical evaluation or forward-looking perspective; summary rather than synthesisAbrupt ending with no conclusion; or unrelated generic conclusion ('thus animal husbandry is important'); no evidence of analytical processing or value addition beyond reproduced facts

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