BCSE Theriogenology and Veterinary Reproduction 2

Question 1

According to the Society for Theriogenology minimum standards, what is the minimum acceptable progressive motility for a bull to pass a breeding soundness evaluation (BSE)?

Accepted Answer

40%

Answer

A satisfactory BSE result requires ≥30% progressive motility, ≥70% morphologically normal sperm, and adequate scrotal circumference; 40% is a common textbook minimum for individual classification as 'satisfactory'.

Question 2

Which method is considered the gold standard for early pregnancy diagnosis in cattle?

Accepted Answer

Transrectal ultrasonography at day 25–28

Answer

Transrectal ultrasonography can reliably detect a bovine embryonic vesicle as early as day 25–28 with high accuracy and allows assessment of embryo viability.

Question 3

Which sperm morphological defect is classified as a MAJOR defect and would reduce a bull's BSE score?

Accepted Answer

Proximal cytoplasmic droplets

Answer

Proximal cytoplasmic droplets are major defects indicating incomplete sperm maturation, whereas distal droplets are minor defects that may indicate rapid transit through the epididymis.

Question 4

The CIDR (Controlled Internal Drug Release) device used in cattle contains which hormone?

Accepted Answer

Progesterone

Answer

The CIDR device releases progesterone intravaginally to synchronize estrus by mimicking the luteal phase and enabling precise timed AI protocols.

Question 5

What is the primary cause of freemartinism in cattle?

Accepted Answer

Vascular anastomosis between twins of opposite sex sharing testosterone

Answer

Freemartinism results from placental vascular anastomoses between male and female twins, allowing testosterone and anti-Müllerian hormone from the male to masculinize the female co-twin.

BCSE - Basic and Clinical Sciences Examination Practice Test

BCSE - Basic and Clinical Sciences Examination Practice Test

BCSE Theriogenology and Veterinary Reproduction 2