BCSE Theriogenology and Veterinary Reproduction 5

Question 1

Which congenital defect in male dogs involves failure of one or both testes to descend into the scrotum by 6 months of age?

Accepted Answer

Cryptorchidism

Answer

Cryptorchidism is the failure of testicular descent and is a hereditary condition; affected dogs should not be used for breeding.

Question 2

What is the approximate gestation length of the domestic sow (pig)?

Accepted Answer

114 days

Answer

The gestation length of the sow is approximately 114 days, often remembered as 3 months, 3 weeks, and 3 days.

Question 3

Bovine viral diarrhea virus (BVDV) infection during which stage of gestation most commonly results in the birth of a persistently infected (PI) calf?

Accepted Answer

Days 42–125

Answer

PI calves result from BVDV infection between approximately days 42–125 of gestation, before the fetal immune system develops and can recognize the virus as foreign.

Question 4

In horses, what structure must be manually ruptured or allowed to resolve before Caslick's vulvoplasty repair can be effective for pneumovagina?

Accepted Answer

Hymen remnant

Answer

A persistent hymen can trap air or fluid in the vagina; however, Caslick's procedure specifically closes the dorsal vulvar lips to prevent pneumovagina caused by poor perineal conformation.

Question 5

Which hormone assay is used to diagnose pregnancy in mares after day 60–90 of gestation by detecting placental endocrine secretion?

Accepted Answer

eCG (equine chorionic gonadotropin)

Answer

eCG (also called PMSG) is produced by the endometrial cups from approximately day 40 to 130–150 of equine gestation and can confirm pregnancy during that window.

BCSE - Basic and Clinical Sciences Examination Practice Test

BCSE - Basic and Clinical Sciences Examination Practice Test

BCSE Theriogenology and Veterinary Reproduction 5