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Animal Husbandry & Veterinary Science 2025 Paper I 50 marks Describe

Paper I — Q6

(a) Describe different types of heritability based on genetic variance components. 10 (b) Explain in detail about the different…

(a) Describe different types of heritability based on genetic variance components. 10 (b) Explain in detail about the different methods of semen collection in livestock and poultry. 20 (c) Describe the different methods to estimate heritability in animals. 20

हिंदी में प्रश्न पढ़ें

(a) आनुवंशिक भिन्नता घटकों के आधार पर विभिन्न प्रकार की आनुवंशिकता (वंशागतित्व) का वर्णन कीजिए । 10 (b) पशुधन एवं पोल्ट्री में वीर्य संग्रहण की विभिन्न विधियों के बारे में विस्तार से व्याख्या कीजिए । 20 (c) पशुओं में आनुवंशिकता (वंशागतित्व) का अनुमान लगाने के विभिन्न तरीकों का वर्णन कीजिए । 20

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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' for part (a) and (c) and 'explain' for part (b) demand comprehensive coverage with technical precision. Allocate approximately 20% time/words to part (a) on heritability types, 40% to part (b) on semen collection methods given its higher marks and need for detail, and 40% to part (c) on heritability estimation methods. Structure with a brief introduction defining genetic variance and reproductive biotechnology, then address each sub-part sequentially with clear sub-headings, and conclude with integration of breeding theory and biotechnology application in Indian livestock improvement.

Key points expected

  • Part (a): Broad-sense heritability (H² = VG/VP) vs narrow-sense heritability (h² = VA/VP) with components VG = VA + VD + VI and VP = VG + VE + VGE
  • Part (a): Partitioning of genetic variance into additive (VA), dominance (VD), and epistatic (VI) components with their breeding significance
  • Part (b): Artificial vagina method for bulls, rams, and bucks with temperature (40-42°C), pressure, and lubrication specifications
  • Part (b): Electroejaculation, massage method, and AV adaptations for poultry (abdominal massage, dummy females, teaser males)
  • Part (c): ANOVA-based methods including half-sib, full-sib, and parent-offspring regression with Falconer's formulae
  • Part (c): REML (Restricted Maximum Likelihood) and Bayesian methods for complex pedigrees; comparison of precision and bias
  • Part (c): Indian examples: heritability estimates for milk yield in Sahiwal, Karan-Fries; semen collection protocols at NDRI Karnal and ICAR-CIRC Meerut

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Demand-directive understanding20%10For (a) precisely distinguishes 'describe' by defining and contrasting heritability types with variance formulae; for (b) fulfills 'explain' with procedural depth including apparatus specifications and species adaptations; for (c) returns to 'describe' with method-wise stepwise exposition of estimation procedures.Uses correct directives superficially—lists heritability types without variance equations, mentions semen methods without technical details, outlines estimation methods without formulae or assumptions.Misinterprets directives—treats all parts identically with vague narration, confuses 'explain' with mere listing, omits mathematical expressions where required.
Content depth & accuracy20%10Accurate variance component equations (Falconer 1989/1996); precise AV specifications (water temp 40-42°C, pressure 15-20 cm Hg); correct ANOVA/REML formulae with degrees of freedom; cites h² ranges for Indian breeds (Sahiwal milk h² ~0.25-0.35).Generally correct content with minor errors—approximate variance formulae, generic AV description without specifications, mentions sib-analysis without detailing covariance expectations.Major technical errors—wrong heritability formulae, confuses semen collection methods across species, states ANOVA without mean squares or confounds phenotypic with genetic variance.
Structure & flow20%10Clear tripartite structure with labeled sections (a), (b), (c); within each, logical progression—definition → classification → detail → significance; seamless transition from genetic theory (a,c) to applied biotechnology (b) showing integrated understanding.Identifiable structure but uneven—parts present but poorly demarcated, some digression between theory and application, abrupt shifts between livestock and poultry without bridging.Disorganized narrative—no clear part separation, random mixing of heritability types with semen methods, missing introduction or conclusion, bullet points without logical ordering.
Examples / case-law / data20%10Indian research citations: NDRI studies on Karan-Fries heritability; ICAR-CIRC Meerut semen collection protocols; specific h² estimates (Murrah buffalo fertility h² ~0.10-0.15); mentions Project Directorate on Cattle (PDC) and Central Sheep and Wool Research Institute (CSWRI) breeding data.Generic or outdated examples—mentions 'Indian dairy cattle' without breed specificity, cites 'research stations' without names, uses approximate h² values without source attribution.No Indian examples—relies entirely on foreign literature (Holstein-Friesian USA data), or completely absent empirical backing; hypothetical or invented statistics.
Conclusion & analytical edge20%10Synthesizes how accurate heritability estimation (c) informs selection programs and how improved semen technology (b) accelerates genetic gain; critiques limitations (e.g., h² environment interaction, semen quality seasonal variation); forward-looking note on genomic selection integration.Summarizes main points without synthesis; standard concluding paragraph restating importance of breeding and biotechnology; no critical evaluation or future direction.Absent or abrupt conclusion; mere restatement of question; no analytical connection between genetic theory and reproductive technology; ends mid-part or with irrelevant generalization.

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