VGO-0067
QUESTION
Synchronization of estrus can be achieved by administering?
OPTIONS
(A) Single injection of FSH
(B) Single injection of GnRH
(C) Combination of FSH and GnRH
(D) Two doses of PGF2α at 11 days interval
ANSWER
(D) Two doses of PGF2α at 11 days interval
EXPLANATION
Two PGF2α treatments approximately 11 days apart synchronize estrus in cycling cattle by ensuring that animals possess a responsive corpus luteum at one of the treatments. Luteolysis reduces progesterone and permits return to estrus. A single FSH injection stimulates follicles rather than reliably synchronizing a herd, while single GnRH treatment or an unspecified FSH-GnRH combination does not represent this established two-injection protocol.
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Veterinary Gynaecology and Obstetrics · 240 Questions