Avian Physiology

• Australorp Breed Profile:
• Developed in Australia through selective breeding of the Black Orpington (which is an English Class breed).
• According to the American Standard of Perfection and poultry classification criteria, Australorps are officially classified under the English Class of poultry, characterized by white skin, red earlobes, and dual-purpose utility.
• nalysis:
• (English): Correct poultry class.

Correct option: (3) English

• American Class of Poultry (Standard of Perfection):
• Breeds belonging to the American Class were developed in the United States and Canada as dual-purpose birds (meat and brown-shelled eggs), characterized by yellow skin, clean (non-feathered) shanks, and red earlobes:
• New Hampshire (developed in New Hampshire from Rhode Island Red)
• Rhode Island Red (RIR)
• Plymouth Rock (Barred / White Rock)
• Wyandotte
• Other Classes: English class (Australorp, Sussex); Mediterranean class (White Leghorn); Asiatic class (Brahma, Cochin).

Correct option: (3) American

• Sperm Nest $\to$ (IV) Infundibulum: Specialized tubular invaginations (sperm storage tubules / sperm nests) located in the infundibulum and uterovaginal junction store viable spermatozoa for up to 2–3 weeks.
• Cock Semen $\to$ (III) Alkaline: Normal rooster semen has an alkaline pH of $7.2\text{ to }7.6$.
• Ringer's Solution $\to$ (I) Semen Extender: Standard isotonic balanced salt solution used to dilute avian semen for artificial insemination.
• Shell Gland $\to$ (II) Uterus: The pouch-like segment where the egg resides for 20 hours for calcium carbonate shell deposition.

Correct option: (2) (A) - (IV), (B) - (III), (C) - (I), (D) - (II)