Pregnancy rates in heifers and suckled beef cows after synchronized ovulation using PGF2", GnRH, and norgestomet

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dc.contributor.author Hoffman, D.P.
dc.contributor.author Stevenson, Jeffrey S.
dc.contributor.author Krehbiel, C.L.
dc.contributor.author Nichols, David A.
dc.contributor.author McKee, R.M.
dc.date.accessioned 2010-09-03T20:59:46Z
dc.date.available 2010-09-03T20:59:46Z
dc.date.issued 2010-09-03T20:59:46Z
dc.identifier.uri http://hdl.handle.net/2097/4843
dc.description.abstract Suckled cows and virgin heifers received a novel treatment that included PGF 2", GnRH, and norgestomet, with the objective of inducing estrus in prepubertal heifers and anestrous suckled cows, as well as synchronizing ovulation in estrus-cycling females. The treatment consisted of two injections of PGF 2" (day 14 and 0) plus 100 Fg of GnRH and a 6-mg norgestomet ear implant on day 7. The implant was removed 24 h after the second injection of PGF2" (day 0), and a second injection of GnRH was given 30 hours after implant removal. The treated females were inseminated 18 hours after the second injection of GnRH or at estrus, if it was detected before the second GnRH injection. Pregnancy rate in the treated females was greater than in control females that had received two injections of PGF 2" 14 days apart and were inseminated at estrus or at one fixed time (60.2 vs. 48%). The treatment successfully induced a fertile ovulation in previously prepubertal heifers and anestrous cows, resulting in 63.5% pregnancies vs. 26.5% for controls. In addition, in females not showing estrus, the treatment increased pregnancy rate following a fixed-time insemination (treatment vs. control; 60.0 vs. 3.8%). We concluded that treatment with PGF2", GnRH, and norgestomet induced estrus and increased pregnancy rates in prepubertal heifers, anestrous cows, and cycling females. en_US
dc.publisher Kansas State University. Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Cattlemen’s Day, 1996 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 96-334-S en_US
dc.relation.isPartOf Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 756 en_US
dc.subject Beef en_US
dc.subject GnRH en_US
dc.subject Norgestomet en_US
dc.subject PGF2 en_US
dc.subject Heat synchronization en_US
dc.subject Prepubertal heifers en_US
dc.subject Anestrous suckled cows en_US
dc.title Pregnancy rates in heifers and suckled beef cows after synchronized ovulation using PGF2", GnRH, and norgestomet en_US
dc.type Conference paper en_US
dc.date.published 1996 en_US
dc.citation.epage 28 en_US
dc.citation.spage 25 en_US
dc.description.conference Cattlemen's Day, 1996, Kansas State University, Manhattan, KS, March 1, 1996 en_US
dc.contributor.authoreid jss en_US
dc.contributor.authoreid dnichols en_US


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