Cattle Reproductive Physiology Quiz

The estrous cycle in cattle lasts approximately:

• 18 days

• 21 days

• 28 days

• 35 days

Which hormone is responsible for luteolysis?

• GnRH

• Progesterone

• PGF₂α

• Estradiol

In the OVSYNCH protocol, when is timed AI performed?

• Immediately after first GnRH

• At the time of PGF₂α injection

• 12-16 hours after second GnRH

• On Day 7

What is the function of GnRH in synchronization protocols?

• Causes regression of CL

• Stimulates ovulation

• Suppresses follicular growth

• Increases progesterone levels

The SELECTSYNCH protocol includes:

• One GnRH and one PGF₂α

• Two GnRH and one PGF₂α

• Two GnRH and two PGF₂α

• Three GnRH injections

The main site of progesterone production in a cycling cow is the:

• Follicle

• Uterus

• Corpus luteum

• Oviduct

Which of the following is NOT part of the female reproductive tract in cattle?

• Ovary

• Uterus

• Vas deferens

• Fallopian tube

The hormone that prepares the uterus for implantation is:

• LH

• FSH

• Progesterone

• Estradiol

Double PG protocol involves administration of prostaglandin on:

• Day 0 and Day 7

• Day 0 and Day 11

• Day 7 and Day 14

• Day 10 and Day 17

Which protocol allows insemination based on observed estrus?

• OVSYNCH

• COSYNCH

• HEATSYNCH

• SELECTSYNCH