Fertility of heifers after synchronization of estrus using GnRH, PGF2α, and progesterone (CIDR)

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dc.contributor.author Richardson, A.M.
dc.contributor.author Hensley, B.A.
dc.contributor.author Marple, T.J.
dc.contributor.author Johnson, Sandra K.
dc.contributor.author Stevenson, Jeffrey S.
dc.date.accessioned 2010-08-06T20:37:56Z
dc.date.available 2010-08-06T20:37:56Z
dc.date.issued 2010-08-06T20:37:56Z
dc.identifier.uri http://hdl.handle.net/2097/4535
dc.description.abstract Our objectives were to determine fertility of heifers after estrus synchronization using PGF2α preceded by either progesterone, GnRH, or both. Beef (n = 193) and dairy (n = 246) heifers were assigned randomly to three treatments: 1) 50 μg of GnRH and a used intravaginal progesterone-releasing insert were administered on day −7, followed by 25 mg of PGF2α on day −1, and CIDR removal on day 0 (CIDR + GnRH + PGF); 2) the same as 1) but without the GnRH (CIDR + PGF); and 3) the same as 1) but without the CIDR (GnRH + PGF; modified Select Synch). Rates of estrus detection were lower in dairy than in beef heifers, and greater in heifers treated with the CIDR. In dairy heifers, conception and pregnancy rates were greatest in the CIDR + PGF treatment, followed by the CIDR + GnRH + PGF and GnRH + PGF treatments. The opposite trend was observed among treatments in beef heifers. All estrus-synchronization treatments produced acceptable estrus detection and pregnancy rates. en_US
dc.publisher Kansas State University. Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Cattlemen’s Day, 2002 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 02-318-S en_US
dc.relation.isPartOf Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 890 en_US
dc.subject Beef en_US
dc.subject Estrus en_US
dc.subject Heifers en_US
dc.subject CIDR-B en_US
dc.subject Fertility en_US
dc.title Fertility of heifers after synchronization of estrus using GnRH, PGF2α, and progesterone (CIDR) en_US
dc.type Conference paper en_US
dc.date.published 2002 en_US
dc.citation.epage 118 en_US
dc.citation.spage 115 en_US
dc.description.conference Cattlemen's Day, 2002, Kansas State University, Manhattan, KS, March 1, 2002 en_US
dc.contributor.authoreid sandyj en_US
dc.contributor.authoreid jss en_US


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