Seasonal variation in the activity of corpus luteum periodicum et graviditas of ewes
1993
Gvozdic, D. | Djurdjevic, Dj. (Faculty of Veterinary Medicine, Belgrade (Yugoslavia). Department of Pathophysiology)
Plasma progesterone levels were determined on the 5th, 8th, 14th and 16th day of the estrous cycle of nonpregnant and pregnant Tsigai ewes, during the breeding season as well as during anoestrus. Estrus was synchronized using intravaginal pessaries impregnated with 60 mg MAP for 14 days and 600 IU PMSG i/m at the removal of pessaries. Progesterone levels were significantly lower in the ewes during anoestrus, compared to the same category of ewes in the breeding seasons. Differences in the progesterone levels between pregnant and nonpregnant Tsigai ewes during one seasonal period became apparent at the 16th day postcoitum.
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