DVM Reproductive Medicine and Theriogenology 3

Question 1

Cats are classified as induced ovulators, meaning that:

Accepted Answer

Ovulation requires the mechanical stimulus of coitus or exogenous GnRH to trigger the LH surge

Answer

Ovulation is spontaneous and occurs predictably at mid-cycle

Answer

Rising estrogen levels alone are sufficient to trigger ovulation without any external stimulus

Answer

Ovulation is controlled entirely by day length and seasonal photoperiod

Question 2

In cryptorchid horses, the retained abdominal testicle:

Accepted Answer

Produces testosterone normally but fails to produce fertile sperm due to elevated intra-abdominal temperature

Answer

Fails to produce testosterone due to disrupted hypothalamic-pituitary signaling

Answer

Produces neither testosterone nor sperm, making the horse completely infertile

Answer

Functions normally if the contralateral testicle is also retained

Question 3

Vaginal cytology in dogs is used primarily to:

Accepted Answer

Determine the stage of the estrous cycle by examining the ratio of superficial, intermediate, and parabasal cells

Answer

Detect uterine infection by identifying intrauterine bacteria

Answer

Confirm that ovulation has occurred by identifying corpus luteum cells

Answer

Measure circulating progesterone concentration indirectly

Question 4

In cattle, fertilization normally occurs at the:

Accepted Answer

Ampullary-isthmic junction of the uterine tube (oviduct)

Answer

Uterine body

Answer

Fimbriated end (infundibulum) of the oviduct

Answer

Uterotubal junction

Question 5

Which of the following best describes relaxin's role in canine reproduction?

Accepted Answer

It is produced by the placenta and serves as a detectable serum marker of true pregnancy from approximately day 25–30

Answer

It induces luteolysis at the end of diestrus in preparation for the next cycle

Answer

It causes cervical softening for parturition but is only detectable at term

Answer

It stimulates oxytocin-mediated milk letdown in lactating bitches

Question 6

In cattle, retained fetal membranes (RFM) are defined as failure to expel the placenta within:

Accepted Answer

24 hours post-partum

Answer

6 hours post-partum

Answer

12 hours post-partum

Answer

48 hours post-partum

Question 7

For non-invasive reproductive monitoring in exotic and zoo animals, which hormones are most commonly measured in fecal samples?

Accepted Answer

Estrogen metabolites (estrone conjugates) and progestagen metabolites, which reflect circulating hormone levels

Answer

LH and FSH, because they are excreted intact in high concentrations

Answer

GnRH and oxytocin, collected from freshly voided urine samples

Answer

Testosterone and cortisol, measured via enzyme-linked immunosorbent assay of saliva