Evaluation of poultry breeding principles:

• Statement (A) is false: White Cornish is used as the male sire line (for broad breast and heavy muscling) while White Plymouth Rock is used as the female dam line (for superior egg production and maternal performance).
• Statement (B) is true: Commercial 4-way and 3-way cross broiler breeding maximizes heterosis (hybrid vigor) in growth rate, body conformation, and feed efficiency.
• Statement (C) is true: Brown/tinted egg layers are produced by crossing White Leghorn males with dual-purpose heavy breeds (RIR, Australorp, New Hampshire) females.
• Statement (D) is false: Crossbreds exhibit developmental homeostasis and buffering capacity, making them less influenced by adverse environmental fluctuations than inbred parental lines.

Breed characteristics and history of Kashmir Merino:

• Development of Kashmir Merino: Synthesized by crossing indigenous migratory sheep of J&K (Gaddi, Bhakarwal, Poonchi, Karnah) with exotic fine wool rams (Delaine Merino, Rambouillet, and Russian Merino) to improve fleece quality, achieving $50\%\text{ to }75\%$ exotic inheritance over decades of selective breeding. Thus, Statement (I) is correct.
• In standard ICAR livestock evaluation documentation, pure Kashmir Merino fine-wool crosses have high nutritional and management demands and are considered delicate compared to hardy native pastoral stock, experiencing performance drop and higher mortality under extreme transhumant migratory conditions. Thus, official key treats Statement (II) as incorrect.
  
  Option analysis:
  Statement (I) is correct but Statement (II) is incorrect, matching Option 3 (Key 3).

Origin and parentage of Hisardale sheep:

• Hisardale is a well-known synthetic fine-wool breed of sheep developed at the Government Livestock Farm (GLF), Hisar (Haryana).
• It was produced by crossing Australian Merino rams with native Bikaneri (Chokla) ewes.
• The crossbred animals were stabilized at approximately $75\%$ Australian Merino and $25\%$ Bikaneri inheritance to produce superior apparel-grade wool.
  
  Option analysis:
• Chokla (Bikaneri) is the female parent breed (Key 1).
• Nali is a carpet wool breed of Rajasthan/Haryana.
• Lohi is a large mutton breed of Pakistan/Punjab.
• Munjal is a tall mutton type sheep of Haryana/Rajasthan.

Wright's inbreeding coefficient calculation for half-sib mating:

• Wright's formula for inbreeding coefficient of individual $I$ is:
  $F_I = \sum (1/2)^{n_1 + n_2 + 1} (1 + F_A)$
  where $n_1$ and $n_2$ are the number of generations from sire and dam to the common ancestor $C$.
• Here, the sire and dam of $I$ are half-sibs sharing one common parent $C$:
  $n_1 = 1$, $n_2 = 1$.