What is the approximate length of the oestrous cycle in a cow?
Correct answer: B. Twenty-one days
- A. Seven days
- B. Twenty-one days
- C. Fourteen days
- D. Thirty-five days
Explanation
The bovine oestrous cycle averages about 21 days, although individual variation occurs. A cycle of about 14 days is more typical of some short-cycle conditions, not the normal cow.
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About Theriogenology and Animal Reproduction
Covers the reproductive anatomy and physiology of male and female domestic animals, including puberty, oestrous cycles, ovulation, fertilisation, pregnancy, parturition and lactation. It also includes artificial insemination, semen evaluation, pregnancy diagnosis, infertility, dystocia and reproductive disorders, with attention to species differences.
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