Progesterone concentrations, estrous response, and fertility in beef heifers after estrous synchronization using melengestrol acetate® and prostaglandin F2α

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dc.contributor.author Peters, C.W.
dc.contributor.author Larson, Robert L.
dc.contributor.author Corah, L.R.
dc.date.accessioned 2010-10-05T19:03:48Z
dc.date.available 2010-10-05T19:03:48Z
dc.date.issued 2010-10-05T19:03:48Z
dc.identifier.uri http://hdl.handle.net/2097/6262
dc.description.abstract Melengestrol acetate (MGA®) and prostaglandin F2α (PG; Lutalyse®) were used to synchronize estrus in 757 yearling, virgin, beef heifers on six commercial ranches. Heifers were inseminated artificially (AI) 12 h after first detected estrus; those not detected in estrus were time-inseminated 72 h post-PG injection. Heifers detected in estrus by 72 h had higher AI and overall pregnancy rates than their counterparts not detected in estrus. Heifers with serum progesterone > 1 ng/ml at PG administration were generally more fertile than those with progesterone < 1 ng/ml. Of the heifers not detected in estrus and with low progesterone (<1 ng/ml), 24% still conceived to the timed insemination at 72 h, but only 73% became pregnant during the entire breeding period. Overall AI conception rate, based on estrous detection and timed insemination, was 49% and varied from 24% to 69% among the six ranches. Heifers exhibiting estrus and with elevated (>1 ng/ml) serum progesterone showed acceptable pregnancy rates (63% AI and 94% overall). en_US
dc.publisher Kansas State University. Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Cattlemen’s Day, 1993 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 93-318-S en_US
dc.relation.isPartOf Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 678 en_US
dc.subject Beef en_US
dc.subject Melengestrol acetate en_US
dc.subject Prostaglandin en_US
dc.subject Beef heifers en_US
dc.subject Fertility en_US
dc.subject Estrus en_US
dc.subject Progesterone en_US
dc.title Progesterone concentrations, estrous response, and fertility in beef heifers after estrous synchronization using melengestrol acetate® and prostaglandin F2α en_US
dc.type Conference paper en_US
dc.date.published 1993 en_US
dc.citation.epage 92 en_US
dc.citation.spage 90 en_US
dc.description.conference Cattlemen's Day, 1993, Kansas State University, Manhattan, KS, March 5, 1993 en_US


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