Minerals, Vitamins & Feed Additives

• Vitamin A Requirements in Poultry:
• Breeding Hens: Demand the highest concentration of Vitamin A in their ration (typically $10,000 - 12,000\text{ IU/kg}$). Vitamin A is critical for embryonic organogenesis, epithelial development, and maximum egg hatchability. Inadequate maternal transfer causes high early embryonic mortality.
• Commercial broilers and layers have lower dietary allowances ($4,000 - 8,000\text{ IU/kg}$).
• nalysis:
• (Breeding hens): Correct class of birds requiring highest vitamin A.

Correct option: (2) Breeding hens

• Metabolizable Energy (ME) Requirements of Layers:
• White Leghorn commercial laying hens in tropical environments (BIS / NRC standards):
• Layer Phase I (Onset to Peak Lay): Formulated with $2600 - 2700\text{ kcal ME/kg}$ (standard BIS: $2700\text{ kcal/kg}$) with $18\%\text{ CP}$ and $3.5-4.0\%\text{ Calcium}$.
• Excess energy ($\gt 2850\text{ kcal/kg}$) leads to fatty liver hemorrhagic syndrome (FLHS) and reduced egg production.
• nalysis:
• (2700 ME): Correct standard layer energy content.

Correct option: (3) 2700 ME

• Always Add Acid to Water: Concentrated acid hydration is violently exothermic; pouring water into concentrated acid can cause superheating and violent splashing. Acid must always be added slowly to water with continuous stirring. (True)
• Always Add Water to Acid: Highly hazardous laboratory practice. (False)
• Indicator in Toluene Distillation Method: In Dean and Stark moisture determination by toluene distillation, phenolphthalein or dye is added to visualize the water-solvent meniscus. (True)
• Antifoaming Agent in Crude Fibre Estimation: In Weende crude fibre analysis, high-protein or pectin-rich feeds generate dense foam during acid/alkali boiling; liquid paraffin or 95% ethyl alcohol is added to suppress foaming. (True)
• Conclusion: Statements (A), (C), and (D) are correct.

Correct option: (1) (A), (C), and (D)