Ovarian follicular waves and secretion of follicle-stimulating hormone after administration of GnRH at estrus

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dc.contributor.author Pursley, J.R.
dc.contributor.author Stevenson, Jeffrey S.
dc.date.accessioned 2011-05-20T15:51:51Z
dc.date.available 2011-05-20T15:51:51Z
dc.date.issued 2011-05-20
dc.identifier.uri http://hdl.handle.net/2097/9175
dc.description.abstract An experiment was conducted to examine the effects of GnRH on the secretion of FSH, LH, estradiol, and progesterone in serum and changes in ovarian structures. Dairy cows were assigned randomly to receive either 100 μg of GnRH or saline 12 hr after estrus (day 0) was detected. Blood was collected daily to assess changes in serum estradiol and progesterone and every 12 min for 8 hr on days 8 and 15 after estrus to assess concentrations of FSH and LH. Diameter and number of follicles were determined daily by real-time ultrasonography. Two patterns of follicular development were observed. The day of peak diameter of each dominant follicle (three or four per cycle) was synchronous with increases in estradiol in serum. The dominant follicle grew at a faster rate in all GnRH-treated cows. We concluded that administering GnRH at estrus increased the pulse frequency of FSH on days 8 and 15 of the cycle, altered follicular dynamics of dominant follicles of the subsequent estrous cycle, and tended to increase concentrations of progesterone in serum of cows. en_US
dc.publisher Kansas Agricultural Experiment Station en_US
dc.relation.isPartOf Dairy Day, 1992 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 93-131-S en_US
dc.subject GnRH en_US
dc.subject Ovarian follicles en_US
dc.subject FSH en_US
dc.subject Estradiol en_US
dc.subject Progesterone en_US
dc.title Ovarian follicular waves and secretion of follicle-stimulating hormone after administration of GnRH at estrus en_US
dc.type Conference paper en_US
dc.date.published 1992 en_US
dc.citation.epage 33 en_US
dc.citation.spage 31 en_US
dc.contributor.authoreid jss en_US

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