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- W2000883235 abstract "The profile of luteinizing hormone (LH) secretion in ewes during anestrus and the estrous cycle was examined. Blood samples were obtained from 2 mature cross-bred and 2 Finnish Landrace ewes at 20-minute intervals over a 24-hour period during anestrus and the estrous cycle. Samples were analyzed for level of LH and progesterone by radioimmunoassay. During anestrus episodic releases of LH were observed in all 4 ewes. LH peaks varied in height from .6 to 10.0 ng/ml. In 3 of the ewes progesterone levels were .5 ng/ml during anestrus. During the estrous cycle there were many LH peaks/24 hours on Days 3 and 14 compared with the single peak observed on Days 9 or 10. Progesterone level decreased from 2.08 to .46 ng/ml during the 24-hour sampling period in Ewe 1 on Day 14 and increased from 168 to 4.88 ng/ml in Ewe 2 on Day 3. In Ewes 3 and 4 the progesterone levels changed from 2.10 to 3.52 ng/ml on Day 9 and from 1.46 to 4.52 ng/ml on Day 10. It appears that progesterone may have an important regulating effect on the tonic LH secretion in the cyclic female by altering the frequency of the pulsatile LH release." @default.
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- W2000883235 date "1977-07-01" @default.
- W2000883235 modified "2023-10-18" @default.
- W2000883235 title "Release of LH in anoestrous and cyclic ewes" @default.
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- W2000883235 doi "https://doi.org/10.1530/jrf.0.0500319" @default.
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