Fertility after timed breeding using GnRH, PGF2, and norgestomet
dc.citation.epage | 94 | en_US |
dc.citation.spage | 92 | en_US |
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.contributor.authoreid | jss | en_US |
dc.contributor.authoreid | dgrieger | en_US |
dc.contributor.authoreid | dnichols | en_US |
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.date.published | 1997 | en_US |
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.description.conference | Cattlemen's Day, 1997, Kansas State University, Manhattan, KS, March 7, 1997 | en_US |
dc.identifier.uri | http://hdl.handle.net/2097/4829 | |
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 |