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

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dc.contributor.author Stevenson, Jeffrey S.
dc.contributor.author Thompson, K. E.
dc.contributor.author Kobayashi, Y.
dc.date.accessioned 2011-07-22T13:51:20Z
dc.date.available 2011-07-22T13:51:20Z
dc.date.issued 2011-07-22
dc.identifier.uri http://hdl.handle.net/2097/10729
dc.description.abstract Two 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.publisher Kansas Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Dairy Day, 1997 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 98-100-S en_US
dc.relation.isPartOf Report of progress (Kansas Agricultural Experiment Station and Cooperative Extension Service); 792 en_US
dc.subject OvSynch en_US
dc.subject Synchronized estrus en_US
dc.subject Conception en_US
dc.subject Pregnancy rates en_US
dc.title Conception and pregnancy rates in dairy cows after various programmed breeding systems en_US
dc.type Conference paper en_US
dc.date.published 1997 en_US
dc.citation.epage 46 en_US
dc.citation.spage 43 en_US
dc.contributor.authoreid jss en_US

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