BCSE Theriogenology and Veterinary Reproduction

Question 1

In the bitch, serum progesterone concentrations above 5 ng/mL typically indicate which reproductive event?

Accepted Answer

Ovulation has occurred

Answer

Progesterone rises above 5 ng/mL after ovulation in the bitch, confirming that ovulation has already taken place.

Question 2

Which stage of the canine estrous cycle is characterized by vaginal cornification >80% and a marked decrease in neutrophils on cytology?

Accepted Answer

Estrus

Answer

During estrus, vaginal cytology shows >80% cornified squamous cells and absence of neutrophils, reflecting peak estrogen influence.

Question 3

In cattle, the corpus luteum (CL) can be lysed using exogenous prostaglandin F2α (PGF2α) between which days of the estrous cycle?

Accepted Answer

Days 5–16

Answer

PGF2α is effective at lysing the CL only from approximately days 5–16 of the bovine estrous cycle when the CL is mature and responsive.

Question 4

What is the average gestation length of the mare?

Accepted Answer

335–345 days

Answer

The average gestation length in mares is approximately 335–345 days, with normal ranges from 320 to 360 days.

Question 5

Which feline reproductive characteristic distinguishes cats from dogs in terms of ovulation?

Accepted Answer

Cats require mating or cervical stimulation to ovulate (induced ovulation)

Answer

Cats are induced ovulators, requiring coital or mechanical cervical stimulation to trigger the LH surge and subsequent ovulation.

BCSE - Basic and Clinical Sciences Examination Practice Test