The Stallion

Question 1

Which glands are present in the horse?

Answer 1

• 2 seminal vesicles
• 2 bulbourethral
• prostate

Question 2

What are the layers of the sccrotum?

Answer 2

• skin
• tunica dartos
• fascia
• vaginal tunic (extends from abdo through inguinal canal)

Question 3

How soon after birth do the testes descend?

Answer 3

• first 2 weeks

Question 4

What are the function of sertoli cells and Leydig cells?

Answer 4

Sertoli cells sperm development, blood testes barrier

Leydig cells produce steroid hormones

Question 5

What age do colts produce ejaculate?

Answer 5

14 months

Question 6

How long is the sperrm production cycle?

Answer 6

57d

Question 7

what may damage to the sertoli cells result in?

Answer 7

antisperm autoantibody production

Question 8

What is the deferent duct?

Answer 8

tube from cauda of epidydimis through spermatic cord

Question 9

What are the glands of the ductus deferens?

Answer 9

Ampullae

Question 10

What are the accessory glands and what is their purpose?

Answer 10

• seminal vesicles: seminal plasma
• Prostate: seminal plasma
• Bulbourethral glands: function unclear

Question 11

which muscle surrounds the urethra?

Answer 11

urethralis muscle - strited, contractsin ejaculation

Question 12

What substances do Leydig cells produce?

Answer 12

Testosterone and Oxytocin (OT facilittes pulstile contraction of seminiferous tubules to help evacuate sperm)

Question 13

What substances do sertoli cells produce?

Answer 13

inhibin and activin (regulate spermatogenesis)

And oestrogens?

Question 14

How many ejaculations per day can most stallions produce?

Answer 14

2-3 in season