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Ovarian changes during early pregnancy in pony mares in relation to PMSG production

Allen, W.E.

Journal of Reproduction and Fertility. Supplement 1975(23): 425-428

1975

ISSN/ISBN: 0449-3087
PMID: 1060819
Document Number: 84908
The ovaries of twenty pregnant mares were palpated per rectum daily for the first 4 months of gestation and note was made of their estimated size and follicular content. Serial blood samples from sixteen of the mares were assayed for PMSG. Season influenced ovarian size, follicular content and ovulation rate during pregnancy, but had no effect on PMSG production. It is concluded that PMSG is synergic with gonadotrophins of pituitary origin and that the latter hormones are the primary stimulus on the ovary of the pregnant mare.

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