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Animal Husbandry & Veterinary Science 2024 Paper I 50 marks Describe

Paper I — Q2

(a) Describe the measurement of energy retention by carbon-nitrogen balance technique. (15 marks) (b) What is "growth curve"?…

(a) Describe the measurement of energy retention by carbon-nitrogen balance technique. (15 marks) (b) What is "growth curve"? Describe the different stages of growth curve in animals. (5+15=20 marks) (c) Write about the nutrient requirement of chicken. (15 marks)

हिंदी में प्रश्न पढ़ें

(a) कार्बन-नाइट्रोजन संतुलन तकनीक द्वारा ऊर्जा प्रतिधारण की माप का वर्णन कीजिए । (15 अंक) (b) "वृद्धि वक्र" क्या है ? जानवरों में वृद्धि वक्र के विभिन्न चरणों का वर्णन कीजिए । (5+15=20 अंक) (c) मुर्गियों की पोषक तत्वों की आवश्यकता के बारे में लिखिए । (15 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 directive 'describe' requires detailed, systematic exposition of processes, concepts and requirements across all three sub-parts. Allocate approximately 35% of time/words to part (a) on C-N balance technique (15 marks), 40% to part (b) on growth curve definition and stages (20 marks), and 25% to part (c) on chicken nutrient requirements (15 marks). Structure with brief introductions for each sub-part, detailed body covering mechanisms/stages/requirements respectively, and a concluding synthesis on nutritional energetics and growth optimization in livestock production.

Key points expected

  • Part (a): Principle of C-N balance technique based on Rubner's energy partition concept; equations for carbon and nitrogen retention; calculation of energy retention as 9.3 × C (g) + 5.7 × N (g); experimental procedure involving bomb calorimetry of feed, feces, urine and gases; limitations and assumptions
  • Part (b): Definition of growth curve as sigmoid pattern of live weight versus age; four distinct stages—pre-natal/embryonic, post-natal acceleration, inflection point, deceleration and maturity; mathematical models (Gompertz, Logistic, von Bertalanffy); factors affecting curve shape (species, breed, sex, nutrition)
  • Part (c): Nutrient requirements across production stages—starter, grower, finisher, layer and breeder; energy (ME kcal/kg), protein/amino acids (lysine, methionine), minerals (Ca, P, Na, Cl, trace elements), vitamins (fat-soluble and water-soluble); NRC (1994) or ICAR standards; breed-specific variations (broiler vs. layer)
  • Interconnection: Relationship between energy measurement (a), growth pattern (b) and practical feeding (c) in poultry production economics
  • Indian context: Application in ICAR research stations; tropical adaptation affecting energy requirements; indigenous breeds like Kadaknath, Aseel growth patterns

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Demand-directive understanding20%10Demonstrates precise understanding that 'describe' in (a) requires step-by-step methodological exposition with equations, in (b) requires both definition and phased elaboration of growth dynamics, and in (c) requires systematic nutrient specification by physiological stage; maintains appropriate depth-to-breadth ratio matching mark allocationProvides adequate description for most parts but either over-elaborates low-mark sections or under-develops high-mark sections; some confusion between 'describe' and 'explain' leading to excessive causation discussionMisinterprets directive as 'discuss' or 'evaluate', producing opinion-based content; fails to recognize differential mark weights across sub-parts; treats all three parts with equal superficiality
Content depth & accuracy20%10For (a): accurate Rubner constants (9.3 kcal/g carbon, 5.7 kcal/g nitrogen), correct energy retention formula, mentions correction for urinary energy; For (b): identifies inflection point mathematically, names at least two growth models; For (c): specifies exact ME values for broiler phases, mentions limiting amino acids beyond lysine-methionine; no factual errorsCorrect basic concepts but with numerical approximations or omissions (e.g., misses urinary energy correction in C-N balance, confuses Gompertz with Logistic parameters, gives rounded ME values without specifying breed/strain)Major conceptual errors—confuses carbon-nitrogen balance with nitrogen balance alone, describes linear rather than sigmoid growth, lists nutrients without stage-specific requirements; confuses energy terms (GE, DE, ME, NE)
Structure & flow20%10Clear tripartite structure with visible demarcation; within (b), distinct sub-sections for definition (5 marks) and stages (15 marks); logical progression from fundamental methodology (a) to biological pattern (b) to applied nutrition (c); effective signposting and transitional coherenceRecognizable structure but uneven internal organization—e.g., stages in (b) not clearly sequenced, or nutrient classes in (c) presented without production-stage framework; some abrupt transitions between sub-partsPoorly organized with mixed content across sub-parts; no visible demarcation between (a), (b), (c); illogical flow such as discussing chicken nutrition before establishing energy measurement principles; missing or muddled stage progression in growth curve
Examples / case-law / data20%10Cites specific data: C-N balance values from classic experiments (e.g., Armsby, Kellner or Indian studies at IVRI/NDRI); growth curve parameters for cattle (Bos indicus vs. Bos taurus), poultry (broiler growth standards: 40g at day 1 to 2.5kg at 42 days); NRC (1994) or ICAR (2013) nutrient specifications with numerical values; mentions Indian breeds like Gir, Sahiwal or Vanaraja growth patternsProvides some numerical data but lacks specificity—e.g., 'approximately 3000 kcal/kg' without specifying ME, breed or standard source; mentions growth models without parameter values; generic reference to 'poultry standards' without citing NRC/ICARNo quantitative data or specific examples; entirely generic descriptions without species, breed or standard references; confuses livestock species (e.g., applies cattle growth parameters to poultry)
Conclusion & analytical edge20%10Synthesizes three sub-parts into coherent nutritional energetics framework—how accurate energy measurement enables growth curve optimization and precise feed formulation; critiques limitations (C-N balance impracticality for routine use, genotype-environment interaction in growth curves); forward-looking note on precision livestock farming or metabolizable energy prediction equations; policy relevance for Indian poultry sector efficiencyBrief concluding summary of main points without true synthesis; acknowledges interconnection between energy, growth and feeding but without analytical depth; no critique or forward-looking elementMissing conclusion or mere repetition of introduction; treats three sub-parts as isolated topics with no integrative insight; no recognition of practical applications or research frontiers

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