VGO-0075
QUESTION
Exogenous oxytocin has luteolytic action in?
OPTIONS
(A) Bitch
(B) Cow & Ewe
(C) Cattle & Sow
(D) Cow & Doe
ANSWER
(D) Cow & Doe
EXPLANATION
Exogenous oxytocin can exert a luteolytic effect in the cow and doe by stimulating uterine release of prostaglandin F₂α (PGF₂α), which causes regression of the corpus luteum and a fall in progesterone secretion. This effect depends on the stage of the estrous cycle and uterine responsiveness to oxytocin. The bitch is not classically included because luteal maintenance in dogs differs markedly from that of ruminants, and the sow is not the standard species cited for this oxytocin-induced luteolytic response. Therefore, option (D), Cow & Doe, is the answer.
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