Synchronization of estrus and ovulation in dairy heifers using norgestomet, GnRH, and PGF[subscript]2alpha

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dc.contributor.author Stevenson, Jeffrey S.
dc.contributor.author Thompson, K. E.
dc.contributor.author Smith, John F., 1962-
dc.contributor.author Hawkins, D. E.
dc.date.accessioned 2011-07-22T13:40:10Z
dc.date.available 2011-07-22T13:40:10Z
dc.date.issued 2011-07-22
dc.identifier.uri http://hdl.handle.net/2097/10727
dc.description.abstract Two experiments were performed using the same treatments. All heifers received two injections of PGF[subscript]2alpha 14 days apart. Controls then were inseminated after detected estrus. Heifers assigned to the two treatments also received 6 mg of norgestomet for 8 days beginning 7 days before the second of two PGF[subscript]2alpha injections. The heifers in the last treatment also received GnRH 48 hr after the second PGF[subscript]2alpha injection to induce ovulation in any heifer not observed in estrus before a fixed-time insemination at 72 hr after PGF2 alpha. In Experiment 1, any control heifer or herifer in the two treatments not detected in estrus by 72 hr after PGF[subscript]2alpha received a fixed-time insemination at 72 hr. Heifers receiving GnRH tended to have fewer standing events and a shorter duration of estrus. Fixed-time inseminations reduced conception compared to those after detected estrus. In Experiment 2, when inseminations were performed only after detected estrus, all measures of fertility were unaffected by treatments. These results indicated that addition of norgestomet and(or) GnRH did not improve measures of estrus synchronization or fertility of dairy heifers. en_US
dc.publisher Kansas Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Dairy Day, 1997 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 98-100-S en_US
dc.relation.isPartOf Report of progress (Kansas Agricultural Experiment Station and Cooperative Extension Service); 792 en_US
dc.subject Estrus synchronization en_US
dc.subject Standing estrus en_US
dc.subject Hormones en_US
dc.subject Heifers en_US
dc.title Synchronization of estrus and ovulation in dairy heifers using norgestomet, GnRH, and PGF[subscript]2alpha en_US
dc.type Conference paper en_US
dc.date.published 1997 en_US
dc.citation.epage 39 en_US
dc.citation.spage 35 en_US
dc.description.conference Dairy Day, 1997, Kansas State University, Manhattan, KS, 1997
dc.contributor.authoreid jss en_US


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