Animal Husbandry & Veterinary Science 2022 Paper I 50 marks Describe
Paper I — Q2
(a) Enlist the various feed additives and describe the merits of use of probiotics in animal rations. (20 marks) (b) Describe…
(a) Enlist the various feed additives and describe the merits of use of probiotics in animal rations. (20 marks) (b) Describe the formulation of least cost rations for swine. (15 marks) (c) Describe the mineral deficiency disorders of animals. (15 marks)
हिंदी में प्रश्न पढ़ें
(a) विभिन्न आहार योगज (एडीटिव) को सूचीबद्ध कीजिए और पशुओं के राशन में प्रोबायोटिक्स के उपयोग के गुणों का वर्णन कीजिए। (20 अंक) (b) सुअरों के लिए कम-से-कम लागत वाले राशन तैयार करने के सूत्रण (फॉर्मूलेशन) का वर्णन कीजिए। (15 अंक) (c) पशुओं में खनिज तत्वों की कमी से होने वाले विकारों 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' demands detailed, systematic exposition of feed additives, ration formulation, and mineral disorders. Allocate approximately 40% of time/words to part (a) given its 20 marks, with 30% each to parts (b) and (c). Structure as: brief introduction defining feed additives and their importance → systematic body covering all three sub-parts with clear sub-headings → concluding synthesis on integrated nutrition management for livestock productivity.
Key points expected
- Part (a): Comprehensive classification of feed additives (antibiotics, probiotics, prebiotics, enzymes, buffers, antioxidants, pigments, etc.) with specific focus on probiotic mechanisms (competitive exclusion, immune modulation, enzyme production) and merits in ruminants and monogastrics
- Part (b): Step-wise least cost ration formulation for swine including nutrient requirements (NRC/ICAR standards), feed ingredient database with cost constraints, use of Pearson square or linear programming methods, and practical constraints in Indian conditions
- Part (c): Systematic description of mineral deficiency disorders categorized as macro-minerals (Ca, P, Mg, Na, K, Cl, S) and trace minerals (Fe, Cu, Zn, Mn, Co, Se, I) with specific clinical signs, species susceptibility, and Indian field conditions
- Integration of Indian context: mention of ICAR feeding standards, NDDB initiatives, regional mineral deficiency belts (e.g., selenium deficiency in Kumaon, fluorosis in Rajasthan), and commercial probiotic products used in Indian dairy industry
- Scientific precision in terminology: CFU counts for probiotics, DE/ME values for swine, ppm requirements for trace minerals, and biochemical basis of deficiency symptoms
- Economic and welfare dimensions: cost-benefit of probiotic use, impact of least cost formulation on feed efficiency (FCR), and production losses from mineral deficiencies in Indian livestock sector
Evaluation rubric
| Dimension | Weight | Max marks | Excellent | Average | Poor |
|---|---|---|---|---|---|
| Demand-directive understanding | 20% | 10 | Demonstrates precise understanding that 'describe' requires systematic, detailed exposition rather than mere listing; for (a) provides functional classification with elaboration, for (b) presents step-wise methodology, for (c) offers clinical-pathological descriptions; maintains appropriate depth-to-breadth ratio across all sub-parts | Partially understands directive; either over-lists without description in (a) or provides narrative without structure in (b) and (c); uneven treatment with one sub-part significantly weaker | Misinterprets directive as 'enumerate' or 'list'; provides bullet points without elaboration; fails to distinguish between descriptive requirements of different sub-parts; significant imbalance in part coverage |
| Content depth & accuracy | 25% | 12.5 | Scientifically accurate throughout: names specific probiotic strains (Lactobacillus, Saccharomyces, Bacillus subtilis), explains linear programming constraints for swine rations, details biochemical pathways of mineral deficiencies (e.g., GSH-Px for Se, T3/T4 synthesis for I); cites ICAR/NRC standards correctly | Generally accurate but lacks specificity; mentions probiotics without strain details, describes Pearson square but not linear programming, lists deficiency signs without pathophysiological basis; minor factual errors in nutrient requirements | Significant scientific errors; confuses probiotics with antibiotics as growth promoters, fails to mention nutrient requirements in (b), generic or incorrect deficiency descriptions; demonstrates fundamental knowledge gaps |
| Structure & flow | 20% | 10 | Clear tripartite structure with distinct, labelled sections for (a), (b), and (c); logical internal organization within each part (classification → mechanisms → merits in (a); principles → methodology → application in (b); macro → micro minerals in (c)); effective signposting and transitions | Identifiable structure but uneven; clear sub-headings but weak internal logic, or strong organization in high-mark part (a) with poor structure in (b) and (c); some repetition or abrupt transitions between sections | Poorly structured or unstructured response; no clear demarcation between sub-parts, random information placement, missing introduction or conclusion; difficult to follow logical progression |
| Examples / case-law / data | 20% | 10 | Rich, specific examples throughout: for (a) mentions Indian commercial probiotics (e.g., Sacchromax, Probios) and field trials from NDRI/IVRI; for (b) illustrates with practical swine ration formulation using Indian feedstuffs (deoiled rice bran, maize gluten); for (c) cites specific Indian deficiency belts (hypocuprosis in Punjab, cobalt deficiency in coastal Odisha, fluorosis in Nalgonda) with prevalence data | Some relevant examples but limited Indian specificity; generic probiotic mentions, standard textbook swine rations without Indian context, well-known deficiencies without regional mapping; examples not fully integrated into description | Few or no concrete examples; entirely generic or textbook-derived content; no Indian context; examples factually incorrect or irrelevant to the specific sub-part demands |
| Conclusion & analytical edge | 15% | 7.5 | Synthesizes three sub-parts into coherent nutrition management framework; critically evaluates limitations (antibiotic resistance concerns driving probiotic use, computational challenges in least cost formulation, bioavailability issues in mineral supplementation); forward-looking on precision nutrition and nanotechnology applications; policy relevance for livestock sector | Brief summary restating main points without synthesis; limited critical engagement; standard concluding statement on importance of balanced nutrition without specific integration of the three themes | Missing or extremely weak conclusion; abrupt ending; no attempt to connect sub-parts or provide analytical closure; purely descriptive throughout with no evaluative or forward-looking element |
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