Die progesteroonkonsentrasie in die bloedplasma van SA Vleismerino-ooie

Author: H.K. Botha en J.C. Morgenthal
Year: 1980
Issue: 2
Volume: 10
Page: 147 - 149

The blood plasma progesterone concentration during 3 different breeding seasons, was studied in 15 South African Mutton Merino ewes. The ewes were bled daily starting at the onset of oestrus until 6 days after the following oestrus period. Plasma progesterone was determined by radioimmuno-assay. The lowest plasma progesterone concentrations (between 0.06 and 0.65 ng/ml) were recorded between 24 hours before and 24 hours after oestrus. Progesterone concentration increased gradually to 1,0 ng/ml during the first 3 days following oestrus. A peak concentration between 3,18 ± 1,15 and 5,34 ± 1,81 ng/ml was found on day 12 of the cycle. Between days 14 and 16 the progesterone concentration decreased rapidly to reach a low point on the day of oestrus. Progesterone concentrations were generally higher during March, while the lowest concentrations were found during October.

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