An investigation into the mechanisms of action of Revalor-S and Optaflexx in growing steers

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dc.contributor.author Walker, D.K.
dc.contributor.author Higgins, James J.
dc.contributor.author Johnson, B.J.
dc.contributor.author Titgemeyer, Evan C.
dc.date.accessioned 2010-08-02T20:29:08Z
dc.date.available 2010-08-02T20:29:08Z
dc.date.issued 2010-08-02T20:29:08Z
dc.identifier.uri http://hdl.handle.net/2097/4333
dc.description.abstract An experiment was conducted to evaluate the interaction between steroidal implantation and feeding ractopamine on nitrogen retention, blood metabolites, and messenger RNA (mRNA) expression. Six Holstein steers (initially weighing 509 lb) were implanted or not with Revalor-S (120 mg trenbolone acetate plus 24 mg estradiol-17β), and all were fed no ractopamine for the initial 28 days and then 2 grams per steer daily of Optaflexx (200 mg/day ractopamine-HCl) on days 29 through 56. Implantation increased nitrogen retention. Optaflexx increased nitrogen retention in nonimplanted steers, but did not significantly increase retained nitrogen in implanted steers. Implantation increased serum insulin-like growth factor (IGF)-I concentration. Optaflexx, however, numerically decreased serum IGF-I concentrations. Implantation numerically increased IGF-I mRNA in the longissimus muscle, but expression of IGF-I mRNA was significantly decreased when Optaflexx was fed. Both growth promotants increased nitrogen retention in steers, but, despite perceived differences in their mode of action, the combination yielded a less than additive response for nitrogen retention. en_US
dc.publisher Kansas State University. Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Cattlemen's Day, 2006 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 06-205-S en_US
dc.relation.isPartOf Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 959 en_US
dc.subject Beef en_US
dc.subject Revalor-S en_US
dc.subject Optaflexx en_US
dc.subject Steers en_US
dc.title An investigation into the mechanisms of action of Revalor-S and Optaflexx in growing steers en_US
dc.type Conference paper en_US
dc.date.published 2006 en_US
dc.citation.epage 19 en_US
dc.citation.spage 15 en_US
dc.description.conference Cattlemen's Day, 2006, Kansas State University, Manhattan, KS, March 3, 2006 en_US
dc.contributor.authoreid etitgeme en_US
dc.contributor.authoreid jhiggins en_US


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