• CNCPS Protein Partitioning:
• Fraction A: Non-Protein Nitrogen (NPN), instantly degraded in the rumen ($A = \text{Soluble Protein} - \text{True Soluble Protein}$).
• Fraction B1: Rapidly degraded true protein (buffer soluble, TCA precipitable).
• Fraction B2: Moderately degraded protein ($B2 = \text{Total Protein} - A - B1 - B3 - C$).
• Fraction B3: Slowly degraded protein associated with plant cell walls:

(Neutral Detergent Insoluble Protein minus Acid Detergent Insoluble Protein).

• Fraction C: Completely indigestible protein ($C = \text{ADIP}$).
• nalysis:
• (NDIP - ADIP): Correct definition of Fraction B3.

Correct option: (4) NDIP -ADIP

• Principles of Haymaking:
• Statement 1: Finished cured hay should contain $\lt 12-15\%$ moisture to prevent mold growth and spontaneous heating (True).
• Statement 2: "Hay is dried more rapidly in the windrow than swath" (Incorrect / False):
• In the swath, the cut forage is spread out in a wide, thin, flat layer exposing maximum surface area to direct solar radiation and wind, drying substantially faster than in a gathered, compact windrow. Windrowing is done primarily after partial field drying to reduce leaf shatter.
• Statement 3: Rain on drying forage leaches soluble sugars and minerals (leaching loss) (True).
• Statement 4: Sun-curing converts ergosterol into Vitamin $D_2$ (ergocalciferol), making hay richer in Vitamin D than silage (True).
• nalysis:
• Statement 2 is incorrect, hence the correct answer.

• Nutritional Characteristics of Rumen Microbes:
• Amino acid composition of specific bacterial and protozoal strains is relatively constant and unaffected by dietary variations (True).
• Protein biological value is high and comparable between bacteria and protozoa (True).
• Protozoal protein has higher true digestibility ($\approx 85-90\%$) than bacterial protein ($\approx 75-80\%$) due to thinner cell boundaries (True).
• Protozoal counts are higher on moderate concentrate/soluble starch diets than on low-quality all-roughage diets (Statement D is False).
• Microbial crude protein contains $\approx 18-22\%$ (average $20\%$) nucleic acids (True).
• nalysis:
• Statements (A), (B), (C), and (E) are true. Hence, Option 2 is correct.