VGO-0173
QUESTION
In sows, maternal recognition of pregnancy is mainly due to the action of?
OPTIONS
(A) Oxytocin
(B) Interferon tau
(C) Oestrogen
(D) Prostaglandins
ANSWER
(C) Oestrogen
EXPLANATION
Estrogen secreted by porcine conceptuses acts as the classical maternal recognition signal, modifying uterine prostaglandin handling and helping preserve the corpora lutea. Interferon tau is the corresponding signal in ruminants. Oxytocin and prostaglandins participate in reproductive regulation, but they are not the principal conceptus-derived recognition signal in the sow. The correct species-specific association is therefore estrogen.
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Veterinary Gynaecology and Obstetrics · 240 Questions
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