Progesterone concentrations, estrous response, and fertility in beef heifers after estrous synchronization using melengestrol acetate® and prostaglandin F2α
dc.citation.epage | 92 | en_US |
dc.citation.spage | 90 | en_US |
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.date.published | 1993 | en_US |
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.description.conference | Cattlemen's Day, 1993, Kansas State University, Manhattan, KS, March 5, 1993 | en_US |
dc.identifier.uri | http://hdl.handle.net/2097/6262 | |
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 |