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 — Correct Answer
- Isthmus
- Magnum
Explanation:
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.
