Topics:
Animal Refresher, Poultry Science
Secretion of Egg Components in Poultry Oviduct
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Question (English)
Egg yolk, albumin and shell membranes of the chicken egg are respectively secreted by:
- Infundibulum, Magnum, Isthmus
- Magnum, Infundibulum, Isthmus
- Ovary, Magnum, Isthmus ✓ Correct
- Ovary, Infundibulum, Magnum
Explanation:
Correct Answer: Ovary, Magnum, Isthmus
Each component of the egg is produced by a specific organ or oviduct segment:
- Egg yolk: Formed in the Ovary. The yolk (ovum) matures in the follicle of the ovary and is released (ovulation) into the infundibulum. The characteristic yellow colour of egg yolk is due to Carotene (xanthophyll pigments).
- Albumin (Egg white): Secreted by the Magnum over about 3 hours. The magnum is the longest oviduct segment (38 cm). Albumin contains ovomucoid (trypsin inhibitor), conalbumin (iron chelating), lysozyme (antibacterial), and avidin (biotin-binding — raw egg white injury factor).
- Shell membranes: Secreted by the Isthmus in about 1 hour 15 minutes. There are two shell membranes — inner and outer — which together with the shell form about 11% of the total egg weight.
Memory Aid
O-M-I-U-V → Ovary (yolk), Magnum (albumin), Isthmus (shell membranes), Uterus (shell + pigment + cuticle), Vagina (oviposition)
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This multiple choice question is from Animal Refresher, Poultry Science. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Refresher to strengthen your preparation.
