In cattle, maternal recognition of pregnancy is primarily achieved when the conceptus secretes:
Correct answer: A. Interferon tau to prevent luteolysis
- A. Interferon tau to prevent luteolysis
- B. Relaxin to initiate cervical closure
- C. Oestrogen to destroy the corpus luteum
- D. Oxytocin to maintain uterine contractions
Explanation
Bovine conceptus interferon tau suppresses endometrial luteolytic signalling, especially oxytocin receptor expression, thereby maintaining the corpus luteum. Continued progesterone secretion is essential for pregnancy support.
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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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