Conception and pregnancy rates in dairy cows after various programmed breeding systems

dc.citation.epage46en_US
dc.citation.spage43en_US
dc.contributor.authorStevenson, Jeffrey S.
dc.contributor.authorThompson, K. E.
dc.contributor.authorKobayashi, Y.
dc.contributor.authoreidjssen_US
dc.date.accessioned2011-07-22T13:51:20Z
dc.date.available2011-07-22T13:51:20Z
dc.date.issued2011-07-22
dc.date.published1997en_US
dc.description.abstractTwo experiments were conducted to measure conception and pregnancy rates in lactating dairy cows after various treatments followed by artificial insemination (AI) after detected estrus or at one fixed time. In Experiment 1, Holstein cows in one herd were assigned randomly to four treatments every 3 wk (27, 3-wk cluster groups): 1)Ovsynch33, 2) GnRH+PGF[subscript]2alpha, 3) 2xPGF[subscript]2alpha, and 4) 2xPGF[subscript]2alpha+GnRH. In Experiment 2, Holstein cows in one herd were assigned randomly to two treatments every 3 wk (14, 3-wk cluster groups): 1) Ovsynch48 and 2) GnRH+PGF[subscript]2alpha. In both experiments, frozen-thawed semen from multiple sires was used, one technician performed >95% of all inseminations, and pregnancy was diagnosed by palpation per rectum between 38 and 52 d after first insemination. Although actual conception rates resulting from inseminations after detected estrus were consistently greater, pregnancy rates of cows were superior after fixed-time inseminations because of poor rates of detected estrus in treatments that relied solely on observation of sexual behavior.en_US
dc.description.conferenceDairy Day, 1997, Kansas State University, Manhattan, KS, 1997
dc.identifier.urihttp://hdl.handle.net/2097/10729
dc.publisherKansas Agricultural Experiment Station and Cooperative Extension Serviceen_US
dc.relation.isPartOfDairy Day, 1997en_US
dc.relation.isPartOfKansas Agricultural Experiment Station contribution; no. 98-100-Sen_US
dc.relation.isPartOfReport of progress (Kansas Agricultural Experiment Station and Cooperative Extension Service); 792en_US
dc.subjectOvSynchen_US
dc.subjectSynchronized estrusen_US
dc.subjectConceptionen_US
dc.subjectPregnancy ratesen_US
dc.titleConception and pregnancy rates in dairy cows after various programmed breeding systemsen_US
dc.typeConference paperen_US

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