Question

Which hormone is used in estrus synchronization in cattle?

• A. Prolactin
• B. Prostaglandin F2α
• C. Insulin
• D. Thyroxine

Hint:

Prostaglandin = CL regression = synchronized estrus!

Answer 1

The Correct Option is B

Estrus synchronization is used to bring a group of animals into heat simultaneously. This makes planned breeding and AI possible. Prostaglandin F2α is commonly used because it causes the regression of the corpus luteum (CL) in animals that are in diestrus phase. When the CL regresses, progesterone drops and the animal returns to estrus within 2–5 days. Other protocols may use progesterone devices (like CIDR) or GnRH for timed AI programs.