Altered insemination timing improves pregnancy rates after a CO-Synch + CIDR protocol

dc.citation.epage7en_US
dc.citation.spage4en_US
dc.contributor.authorDobbins, C. A.
dc.contributor.authorTenhouse, D. E.
dc.contributor.authorEborn, D. R.
dc.contributor.authorJohnson, Sandra K.
dc.contributor.authorHarmoney, Keith R.
dc.contributor.authorStevenson, Jeffrey S.
dc.contributor.authoreidsandyjen_US
dc.contributor.authoreidkharmoneen_US
dc.date.accessioned2010-01-21T20:15:54Z
dc.date.available2010-01-21T20:15:54Z
dc.date.issued2010-01-21T20:15:54Z
dc.date.published2007en_US
dc.description.abstractOur objective was to determine the optimal time to inseminate lactating beef cows after applying the CO-Synch + CIDR protocol [injection of GnRH given seven days before and 48 to 72 hr after an injection of prostaglandin F2α (PGF2α) concurrent with AI, with a controlled internal drug release (CIDR) insert containing progesterone placed intravaginally for seven days between the first GnRH injection and PGF2α.]. Using 605 beef cows located at three Kansas locations, the CO-Synch + CIDR protocol was administered as follows: an injection of GnRH was given concurrent with a vaginally placed, progesterone-releasing CIDR insert, seven days later the insert was removed, and PGF2α was injected. Blood samples were collected 10 days before initiating the protocol and at the time of GnRH injection and CIDR insertion to determine concentrations of progesterone. Cows in each herd were inseminated at four different times after the PGF2α injection: 48, 56, 64, or 72 hours. At insemination, each cow received a GnRH injection to induce ovulation. Pregnancy was diagnosed at 32 days after insemination and again at 63 days after insemination to confirm pregnancy survival. Pregnancy rates were greatest for those cows inseminated at 56 or 64 hours.en_US
dc.description.conferenceCattlemen's Day, 2007, Kansas State University, Manhattan, KS, March 2, 2007en_US
dc.identifier.urihttp://hdl.handle.net/2097/2416
dc.publisherKansas State University. Agricultural Experiment Station and Cooperative Extension Serviceen_US
dc.relation.isPartOfCattlemen's Day, 2007en_US
dc.relation.isPartOfKansas Agricultural Experiment Station contribution; no. 07-179-Sen_US
dc.relation.isPartOfReport of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 978en_US
dc.subjectBeefen_US
dc.subjectCattleen_US
dc.subjectCO-Synchen_US
dc.subjectCIDR protocolen_US
dc.subjectA.I.en_US
dc.titleAltered insemination timing improves pregnancy rates after a CO-Synch + CIDR protocolen_US
dc.typeConference paperen_US

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