Fertility after timed breeding using GnRH, PGF2, and norgestomet

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dc.contributor.author Thompson, K. E.
dc.contributor.author Lamb, G.C.
dc.contributor.author Marple, T.J.
dc.contributor.author Corah, L.R.
dc.contributor.author McKee, R.M.
dc.contributor.author Stevenson, Jeffrey S.
dc.contributor.author Grieger, David M.
dc.contributor.author Nichols, David A.
dc.date.accessioned 2010-09-02T21:11:52Z
dc.date.available 2010-09-02T21:11:52Z
dc.date.issued 2010-09-02T21:11:52Z
dc.identifier.uri http://hdl.handle.net/2097/4829
dc.description.abstract At the KSU Purebred Unit, 164 purebred Angus, Hereford, and Simmental cows were used to test a new estrus-synchronization program using GnRH, PGF2, and norgestomet. Cows were inseminated after detected estrus, or in the absence of estrus, inseminations were made at one fixed time after a second injection of GnRH. The treatment consisted of a 100 µg injection of GnRH plus a 6-mg ear implant of norgestomet. Seven days later, the ear implant was removed, and 25-mg of PG F2% was injected. In the absence of estrus, the time-bred group received a second injection of GnRH 48 h after PGF2% and was inseminated 16 h later. The treatment induced 10 of 36 anestrous cows to ovulate. Conception rates tended (P<.09) to be greater in Angus (72.2%) than Hereford cows (52.8%) , with conception rates in Simmental cows (51.5%) being similar to those in Hereford. Overall, pregnancy rates were similar between the time-bred group (59.3%) and the estrus-bred group (53.8%). We conclude that using GnRH, PG F2%, and norgestomet in a timed breeding program ca n eliminate the necessity of heat detection. In addition, the treatment induced estrus in 28% of the noncycling cows. en_US
dc.publisher Kansas State University. Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Cattlemen’s Day, 1997 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 97-309-S en_US
dc.relation.isPartOf Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 783 en_US
dc.subject Beef en_US
dc.subject GnRH en_US
dc.subject PGF2 en_US
dc.subject Norgestomet en_US
dc.subject Timed breeding en_US
dc.subject Anestrous suckled cows en_US
dc.subject Induced ovulation en_US
dc.title Fertility after timed breeding using GnRH, PGF2, and norgestomet en_US
dc.type Conference paper en_US
dc.date.published 1997 en_US
dc.citation.epage 94 en_US
dc.citation.spage 92 en_US
dc.description.conference Cattlemen's Day, 1997, Kansas State University, Manhattan, KS, March 7, 1997 en_US
dc.contributor.authoreid jstevens en_US
dc.contributor.authoreid dgrieger en_US
dc.contributor.authoreid dnichols en_US

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