Concentrations of progesterone and conception rates in Holstein heifers after hCG administration during the first 3 weeks after estrus

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dc.contributor.author Stewart, R.E.
dc.contributor.author Mee, M.O.
dc.contributor.author Stevenson, Jeffrey S.
dc.date.accessioned 2012-09-20T19:33:42Z
dc.date.available 2012-09-20T19:33:42Z
dc.date.issued 2012-09-20
dc.identifier.uri http://hdl.handle.net/2097/14727
dc.description.abstract We conducted two experiments to determine the effects of administering human chorionic gonadotropin (hCG) on day 4 or on days 15, 16, and 17 after estrus on conception rates and progesterone secretion by the corpus luteum in Holstein heifers. In the first experiment, 60 heifers received hCG or saline on day 4 after estrus and AI. Conception rates were similar between groups. Concentrations of progesterone were increased in treated pregnant and nonpregnant heifers 7 and 14 days after treatment compared with pregnant and nonpregnant controls. In the second experiment, 62 heifers received hCG or saline on days 15, 16, and 17 after estrus and AI. Conception rates again were similar between groups. Concentrations of progesterone were higher in treated pregnant heifers on days 16, 17, and 21 after estrus and in treated nonpregnant heifers on days 17 and 21 compared with pregnant and nonpregnant controls. We conclude that stimulation of the newly formed or mature corpus luteum by hCG increased production of progesterone without affecting conception rates. en_US
dc.publisher Kansas Agricultural Experiment Station en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 88-114-S en_US
dc.relation.isPartOf Report of progress (Kansas Agricultural Experiment Station); 527 en_US
dc.subject Dairy en_US
dc.subject Progesterone en_US
dc.subject Conception rate en_US
dc.subject Human chorionic gonadotropin (hCG) en_US
dc.subject Conception rate en_US
dc.title Concentrations of progesterone and conception rates in Holstein heifers after hCG administration during the first 3 weeks after estrus en_US
dc.type Conference paper en_US
dc.date.published 1987 en_US
dc.citation.epage 29 en_US
dc.citation.spage 27 en_US
dc.description.conference Dairy Day, 1987, Kansas State University, Manhattan, KS, 1987
dc.contributor.authoreid jss en_US


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