(a) Describe nutritional characteristics of feed ingredients which are generally incorporated in formulation of poultry feed. (20 marks)
(b) Enlist hemorrhagic disorders in animals and describe congenital thrombocytopenia in dogs. (5+10=15 marks)
(c)

Question

(a) Describe nutritional characteristics of feed ingredients which are generally incorporated in formulation of poultry feed. (20 marks)
(b) Enlist hemorrhagic disorders in animals and describe congenital thrombocytopenia in dogs. (5+10=15 marks)
(c) What is idealized animal population ? Describe the chromosomal theory of sex determination in animals. (5+10=15 marks)

UPSC Answer Check · Accepted Answer

The question demands descriptive treatment across three distinct domains: poultry nutrition (20 marks), hematological disorders (15 marks), and population genetics with sex determination (15 marks). Allocate approximately 40% of time/words to part (a) covering energy sources, protein supplements, minerals and vitamins with their nutritional specifications; 30% to part (b) listing hemorrhagic disorders followed by detailed pathophysiology of congenital thrombocytopenia in dogs; and 30% to part (c) defining idealized population concepts before explaining XX-XY, ZZ-ZW and haplodiploid mechanisms with chromosomal evidence. Structure with clear sub-headings for each part and conclude with integrative remarks on clinical/genetic applications.
- Part (a): Nutritional characteristics of cereals (maize, sorghum), protein sources (soybean meal, fish meal, meat meal), fats/oils, and micro-minerals (Mn, Zn, Se) with their metabolizable energy, crude protein, and limiting amino acid profiles
- Part (a): Anti-nutritional factors in poultry feed ingredients (trypsin inhibitors in soybean, gossypol in cottonseed meal, glucosinolates in rapeseed meal) and their mitigation strategies
- Part (b): Comprehensive enumeration of hemorrhagic disorders including thrombocytopenia, hemophilia A/B, von Willebrand disease, disseminated intravascular coagulation, and vitamin K deficiency
- Part (b): Pathogenesis, clinical signs (epistaxis, melena, petechiation), diagnosis (platelet count <50,000/μL, bone marrow biopsy), and breed predisposition (Cavalier King Charles Spaniel, Great Dane) for congenital thrombocytopenia
- Part (c): Definition and assumptions of idealized population (Hardy-Weinberg equilibrium): infinite size, random mating, no selection/mutation/migration, with implications for genetic conservation
- Part (c): Chromosomal mechanisms of sex determination—XX-XY (mammals), ZZ-ZW (birds, some reptiles), haplodiploidy (Hymenoptera), and environmental sex determination with Barr body/sex chromatin evidence
- Part (c): Role of SRY gene on Y chromosome, dosage compensation via X-inactivation, and primary sex ratio theories in poultry breeding contexts

Dimension	Weight	Max marks	Excellent	Average	Poor
Demand-directive understanding	20%	10	Correctly interprets 'describe' for (a) and (c) with detailed elaboration of processes/mechanisms, and 'enlist' for (b) with systematic categorization; maintains appropriate depth proportional to marks (20:15:15) without conflating directives	Generally understands describe/enlist distinction but may under-enumerate in (b) or provide superficial description in (a); mark allocation somewhat misaligned with weightage	Misinterprets directives—lists instead of describing in (a), or fails to enumerate before describing in (b); treats all parts equally despite unequal marks; confuses 'idealized population' with general population concepts
Content depth & accuracy	20%	10	Precise nutritional specifications (ME values, CP%, amino acid scores) in (a); accurate pathophysiology of macrothrombocytopenia with current genetic markers (ITGA2B, ITGB3) in (b); correct chromosome nomenclature and gene mechanisms in (c); no factual errors across all three domains	Broadly correct content with some numerical inaccuracies in feed composition or incomplete genetic pathways; mentions key disorders and sex determination types but lacks mechanistic detail	Significant errors—confuses metabolizable energy with digestible energy, misidentifies hemophilia as platelet disorder, states incorrect chromosome complements (e.g., XY in birds), or omits core concepts entirely
Structure & flow	20%	10	Clear tripartite structure with labeled sub-sections (a), (b), (c); logical progression within each (e.g., energy → protein → additives in (a); list → detailed pathology in (b); definition → mechanisms → examples in (c)); seamless transitions between domains	Identifiable parts but uneven internal organization; some mixing of content between (b) and (c) or repetitive presentation in (a); adequate but not optimal signposting	Disorganized or fragmented response; no clear demarcation between parts; random presentation of facts; missing sub-headings makes evaluation difficult; conclusion absent or misplaced
Examples / case-law / data	20%	10	Specific Indian context: ICAR feed composition tables, NRC (1994) poultry standards for (a); breed-specific cases (Indian breeds like Rajapalayam for bleeding disorders) and diagnostic thresholds for (b); Indian livestock census data on sex ratios and poultry breeding programs for (c); cites BIS standards where relevant	Generic examples without Indian specificity; mentions common breeds (Leghorn, Broiler) but not Indian varieties; standard textbook data without current references; adequate but not enriched with applied context	No examples or data; purely theoretical treatment; incorrect or invented statistics; fails to connect concepts to veterinary practice or livestock industry applications
Conclusion & analytical edge	20%	10	Synthesizes across parts: links precision nutrition in (a) to genetic improvement programs in (c), and hematological diagnostics in (b) to breeding soundness; critically evaluates limitations of idealized population models in real conservation scenarios; projects future directions (genomic selection, marker-assisted breeding)	Brief summary restating main points without true synthesis; limited critical engagement; conventional closing without forward-looking or integrative perspective	No conclusion or abrupt ending; purely descriptive throughout without analysis; fails to demonstrate veterinary/clinical relevance of theoretical concepts; missing value addition beyond textbook reproduction

(a) Describe nutritional characteristics of feed ingredients which are generally incorporated in formulation of poultry feed. (20…

Directive word: Describe

How this answer will be evaluated

Approach

Key points expected

Evaluation rubric

Practice this exact question

More from Animal Husbandry & Veterinary Science 2023 Paper I