Effects of MGA and PGF on estrus induction and synchronization in cows and heifers
dc.citation.epage | 46 | en_US |
dc.citation.spage | 42 | en_US |
dc.contributor.author | Boyd, G.W. | |
dc.contributor.author | Patterson, D.J. | |
dc.contributor.author | Corah, L.R. | |
dc.contributor.author | Brethour, J.R. | |
dc.date.accessioned | 2010-12-03T21:20:22Z | |
dc.date.available | 2010-12-03T21:20:22Z | |
dc.date.issued | 2010-12-03 | |
dc.date.published | 1986 | en_US |
dc.description.abstract | Three trials were conducted in the spring of 1985 to evaluate the effectiveness of MGA feeding and Prostaglandin (PGF) injection on estrus induction and synchronization. Trials 1 and 2 were both done on a Kansas ranch and involved 70 heifers and 86 cows, respectively. In both trials, all cycling and non-cycling females were fed MGA (7 days in trial 1, 9 days in trial 2) and half of the cows and heifers received a PGF injection. The estrus response was higher (P<.0l) for the cycling heifers with the combination treatment. Both treatments resulted in similar first service conception rates and both were effective in inducing estrus in noncycling heifers. Only a small percentage of the cows in trial 2 were cycling prior to the treatments and only a small percentage of the non-cycling cows responded to the MGA. In trial 3, half of the cycling heifers were fed MGA for 7 days and PGF was injected on day 7. Response to synchronization peaked 96 to 120 hr following MGA withdrawal. Among F1 Angus X Hereford heifers, the MGA-PGF treatment reduced (P<.0l) first service conception rates as compared to controls (55 vs 80%), although a reduction was not seen with F Brahman X Hereford heifers. Conversely, 45-day pregnancy rates tended to be higher among both groups of synchronized heifers (P>.05). The MGA treatment also initiated cyclicity in prepuberal females of both crosses. | en_US |
dc.description.conference | Cattlemen's Day, 1986, Kansas State University, Manhattan, KS, March, 1986 | en_US |
dc.identifier.uri | http://hdl.handle.net/2097/6780 | |
dc.publisher | Kansas State University. Agricultural Experiment Station and Cooperative Extension Service | en_US |
dc.relation.isPartOf | Cattlemen’s Day, 1986 | en_US |
dc.relation.isPartOf | Kansas Agricultural Experiment Station contribution; no. 86-320-S | en_US |
dc.relation.isPartOf | Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 494 | en_US |
dc.subject | Beef | en_US |
dc.subject | MGA | en_US |
dc.subject | PGF | en_US |
dc.subject | Estrus | en_US |
dc.subject | Synchronization | en_US |
dc.title | Effects of MGA and PGF on estrus induction and synchronization in cows and heifers | en_US |
dc.type | Conference paper | en_US |