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Serum levels of prolactin and luteinizing hormone (LH) in the ewe at various stages of the oestrous cycle


, : Serum levels of prolactin and luteinizing hormone (LH) in the ewe at various stages of the oestrous cycle. Proc. Soc. exp. Biol. Med, 134: 4, 938-42

Serum prolactin and luteinizing hormone (LH) concn. (ng/ml), measured by radioimmunoassay in blood samples taken from 3 Whitefaced ewes during 5 oestrous cycles, were respectively, 40 and 56 on day 1 of oestrus, 11 and 1.9 on day 2 of oestrus, 15 and 1.6 at metoestrus, 13 and 1.3 at dioestrus and 49 and 1.4 at pro-oestrus. Prolactin concn.was significantly (P < 0.05) higher at pro-oestrus than during the rest of the cycle. There was no correlation between serum prolactin and LH levels, although the increase in LH concn. occurred at a time when serum prolactin levels were still high.

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PMID: 5457753


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