Plasma melatonin in ewes after ovariectomy

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Abstract
Six ewes were ovariectomized in late Nov. and kept in natural light with 5 intact controls. LH [luteinizing hormone] levels were monitored approximately weekly. On Days 16 and 58 after ovariectomy plasma melatonin was determined at 3-h intervals for 24 h in all the ewes. Plasma melatonin concentrations were greater in the ovariectomized ewes than in the controls especially at 16 days when total 24 h secretion was almost 3 times that in the control ewes. In the ewe, the gonads exert an inhibitory influence on melatonin secretion.

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