Topics:
Animal Refresher, Animal Reproduction
Site of Fertilization in Cattle
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Question (English)
The site of fertilization in cattle is:
- Ampullary-isthmic junction ✓ Correct
- Isthmus
- Ampulla
- Uterus
Explanation:
Correct Answer: Ampullary-isthmic junction
In cattle (and all domestic animals), fertilization occurs at the Ampullary-isthmic junction (AIJ) — the junction between the ampulla (wider, upper portion) and the isthmus (narrower, lower portion) of the oviduct (Fallopian tube).
Why Fertilization Occurs at AIJ
- Spermatozoa, after being deposited in the cervix during AI or natural mating, migrate upward through the uterus and into the oviduct — the isthmus acts as a sperm reservoir.
- The ovulated oocyte, swept into the oviduct by the infundibulum, moves down the ampulla.
- Sperm released from the isthmus reservoir meet the oocyte at the ampullary-isthmic junction.
Post-Fertilization Journey
- Fertilized ovum → zygote → cleaves as it moves down the oviduct → enters uterus as morula/blastocyst → implants in endometrium.
📚 About this Topic — Animal Refresher
This multiple choice question is from Animal Refresher, Animal Reproduction. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Refresher to strengthen your preparation.
