Variations in the ovsynch protocol alter pregnancy rates in lactating dairy cows

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dc.contributor.author Portaluppi, M.A.
dc.contributor.author Stevenson, Jeffrey S.
dc.date.accessioned 2010-12-10T17:37:15Z
dc.date.available 2010-12-10T17:37:15Z
dc.date.issued 2010-12-10
dc.identifier.uri http://hdl.handle.net/2097/6876
dc.description.abstract Initiation of the Ovsynch protocol at random stages of the estrous cycle produces differences in synchronization and pregnancy rates. Use of two injections of PGF2α administered 14 days apart, with the second injection given 12 days before initiating the Ovsynch protocol increased the percentage of cows that start the Ovsynch protocol at a more desirable stage of the estrous cycle (e.g., between days 5 and 13). In this experiment, after applying the Presynch-Ovsynch protocol, timing of the second injection of GnRH and insemination were altered to determine their effect on pregnancy rates. Cows that received the second GnRH injection at the same time as they were inseminated at 72 hours after PGF2α had greater pregnancy rates than cows that received the second GnRH injection at 48 hours after PGF2α and were inseminated 0 or 24 hours later. en_US
dc.publisher Kansas State University. Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Diary Day, 2003 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 04-129-S en_US
dc.relation.isPartOf Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 919 en_US
dc.subject Dairy en_US
dc.subject Ovsynch en_US
dc.subject Presynch en_US
dc.subject Pregnancy rates en_US
dc.title Variations in the ovsynch protocol alter pregnancy rates in lactating dairy cows en_US
dc.type Conference paper en_US
dc.date.published 2003 en_US
dc.citation.epage 56 en_US
dc.citation.spage 54 en_US
dc.contributor.authoreid jss en_US

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