Estrus synchronization of suckled beef cows by using GnRH, prostaglandin F2α (PGF), and progesterone (CIDR): a multi-location study

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dc.contributor.author Larson, J.E.
dc.contributor.author Lamb, G.C.
dc.contributor.author Stevenson, Jeffrey S.
dc.contributor.author Marston, T.W.
dc.contributor.author Johnson, Sandra K.
dc.contributor.author Day, M.L.
dc.contributor.author Geary, T.W.
dc.contributor.author Kesler, D.J.
dc.contributor.author DeJarnette, J.M.
dc.contributor.author Schrick, F.N.
dc.contributor.author Areseneau, J.D.
dc.date.accessioned 2010-08-03T17:53:05Z
dc.date.available 2010-08-03T17:53:05Z
dc.date.issued 2010-08-03T17:53:05Z
dc.identifier.uri http://hdl.handle.net/2097/4410
dc.description.abstract Our objectives were to determine whether a fixed-time artificial insemination (TAI) protocol could yield pregnancy rates similar to a protocol requiring detection of estrus and whether inclusion of a CIDR (a vaginal insert containing progesterone) in protocols using gonadotropin-releasing hormone (GnRH) and prostaglandin F2α (PGF) would enhance fertility. Postpartum suckled beef cows (n = 2,630) from 14 locations were assigned randomly to each of five estrus-synchronization protocols using PGF with GnRH and(or) a CIDR. Protocols were Control, CO-Synch, COSynch+ CIDR, Hybrid-Synch, and Hybrid-Synch+CIDR. The percentage of cows cycling at the initiation of estrus synchronization was 66.8%, the percentage of cycling cows ranging from 38 to 90% among locations. Overall pregnancy among locations ranged from 39% to 67%. Pregnancy rates were greatest for the Hybrid-Synch+CIDR (57.9%) treatment, although not significantly different from the CO-Synch+CIDR (53.6%) and Hybrid-Synch (53.0%) treatments, but greater than the Control (52.3%) and CO-Synch (43.4%), which yielded the poorest pregnancy rates. Overall, the Hybrid-Synch+CIDR protocol (AI after detected estrus for 3 days, and then a clean-up TAI) achieved the greatest pregnancy rates, but CO-Synch+CIDR is a reliable, fixed-time AI protocol that gives producers the option to eliminate en_US
dc.publisher Kansas State University. Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Cattlemen's Day, 2004 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 04-242-S en_US
dc.relation.isPartOf Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 923 en_US
dc.subject Beef en_US
dc.subject Estrus synchronization en_US
dc.subject Prostaglandin F2α (PGF) en_US
dc.subject Progesterone (CIDR) en_US
dc.title Estrus synchronization of suckled beef cows by using GnRH, prostaglandin F2α (PGF), and progesterone (CIDR): a multi-location study en_US
dc.type Conference paper en_US
dc.date.published 2004 en_US
dc.citation.epage 10 en_US
dc.citation.spage 7 en_US
dc.description.conference Cattlemen's Day, 2004, Kansas State University, Manhattan, KS, March 5, 2004 en_US
dc.contributor.authoreid jstevens en_US
dc.contributor.authoreid sandyj en_US

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