Fertility after timed breeding using GnRH, PGF2, and norgestomet

K-REx Repository

Show simple item record

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 jss en_US
dc.contributor.authoreid dgrieger en_US
dc.contributor.authoreid dnichols en_US

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search K-REx

Advanced Search


My Account

Center for the

Advancement of Digital


118 Hale Library

Manhattan KS 66506

(785) 532-7444