Synchronized ovulation with gonadotropin-releasing hormone, prostaglandin F and fixed-time insemination

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Show simple item record Kobayashi, Y. Stevenson, Jeffrey S. 2011-05-06T20:22:05Z 2011-05-06T20:22:05Z 2011-05-06
dc.description.abstract Summary Lactating Holstein cows and replacement heifers were treated with a novel synchronized ovulation protocol, which involves one fixedtime insemination without heat detection. One injection of GnRH (Cystorelin®) was given, followed in 7 days with an injection of PGF2a (Lutalyse®). Approximately 32 to 36 hr later, ovulation was induced with a second injection of GnRH, and one fixed-time insemination was given 18 hr later. Control cattle were given one injection of PGF and inseminated at observed 2a estrus. Pregnancy rates measured by palpation between 38 and 52 days after insemination in controls (47.1%) were slightly, but not significantly, greater than those in the synchronized ovulation treatment (35.3%). The treatment worked much better in lactating cows than in virgin heifers. This treatment may be particularly well suited to cows in which estrus is rarely observed, as well as for synchronizing first or repeat services. en_US
dc.publisher Kansas Agricultural Experiment Station en_US
dc.relation.isPartOf Dairy Day, 1995 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 96-106-S en_US
dc.relation.isPartOf Report of progress (Kansas Agricultural Experiment Station and Cooperative Extension Service); 742 en_US
dc.subject Prostaglandin en_US
dc.subject Gonadotropin-releasing hormone en_US
dc.subject Synchronized ovulation en_US
dc.subject Pregnancy rates en_US
dc.title Synchronized ovulation with gonadotropin-releasing hormone, prostaglandin F and fixed-time insemination en_US
dc.type Conference paper en_US 1995 en_US
dc.citation.epage 37 en_US
dc.citation.spage 35 en_US
dc.description.conference Dairy Day, 1995, Kansas State University, Manhattan, KS, 1995
dc.contributor.authoreid jss en_US

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