Which endocrine change is most closely associated with the initiation of normal parturition in domestic mammals?
Correct answer: A. A rise in fetal cortisol
- A. A rise in fetal cortisol
- B. A permanent fall in maternal FSH
- C. A rise in maternal melatonin
- D. A complete loss of uterine prostaglandins
Explanation
In many domestic mammals, increased fetal adrenal cortisol initiates placental and maternal endocrine changes that promote oestrogen, prostaglandin, and uterine activity. The other options do not describe the normal initiating pathway.
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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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