Which finding provides the most direct early confirmation of pregnancy in a cow using ultrasonography?
Correct answer: D. A visible embryonic heartbeat
- A. A large mature follicle
- B. A softening of the cervix
- C. A reduced rectal temperature
- D. A visible embryonic heartbeat
Explanation
Detection of an embryonic heartbeat by ultrasonography is direct evidence of a living conceptus. A follicle or cervical change alone cannot reliably confirm pregnancy.
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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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