Topics: Animal Refresher, Poultry Science

Part of Oviduct Where Egg Stays Longest

The egg stays for the maximum time in which part of the oviduct?

Infundibulum
Uterus
Isthmus
Magnum

Part of Oviduct Where Egg Stays Longest

The egg stays for the maximum time in which part of the oviduct?

Options

Infundibulum
Uterus ✓
Isthmus
Magnum

Correct Answer: B

Explanation in English

Correct Answer: Uterus

The egg spends the maximum time in the Uterus — approximately 21 hours. This is where the hard shell, shell pigments, and cuticle are deposited over the egg.

Time Spent in Each Part of the Oviduct

Part	Time	Function
Infundibulum	15 min	Collects yolk; fertilization
Magnum	3 hours	Secretes albumin
Isthmus	1 hr 15 min	Secretes shell membranes
Uterus	21 hours	Secretes shell, pigments, cuticle
Vagina	—	Holds egg until oviposition

Total time for egg formation = 24–26 hours (length of the ovulatory cycle).

Why the Uterus Takes So Long

Shell formation is a complex mineralisation process: calcium carbonate crystals are deposited layer by layer around the egg.
The hen must mobilise large amounts of calcium from medullary bone and dietary sources every day.

Why Other Options Are Wrong

Infundibulum → only 15 minutes (fertilization and yolk pickup).
Isthmus → 1 hr 15 min (shell membrane deposition).
Magnum → 3 hours (albumin deposition; longest AFTER uterus, but still shorter).

📚 About this Topic — Animal Refresher

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.

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