Effect of feedlot management system on response to ractopamine-HCl in yearling steers

Two experiments evaluated the effects of conventional and natural feedlot management systems (MS) on ractopamine-HCl (RAC) response in yearling steers. Feedlot performance, carcass characteristics, skeletal muscle gene expression, and circulating IGF-I concentrations were measured. The conventional...

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Veröffentlicht in:	Journal of animal science 2008-09, Vol.86 (9), p.2401-2414
Hauptverfasser:	Winterholler, S.J, Parsons, G.L, Walker, D.K, Quinn, M.J, Drouillard, J.S, Johnson, B.J
Format:	Artikel
Sprache:	eng
Schlagworte:	Adrenergic beta-Agonists - pharmacology agricultural management Animal Husbandry - methods Animal Nutritional Physiological Phenomena animal performance Animal productions Animals beef beef quality Biological and medical sciences Biopsy - veterinary Body Weight carcass characteristics carcass evaluation Cattle - genetics Cattle - metabolism Cattle - physiology dressing percentage drug implants feed additives feedlots Fundamental and applied biological sciences. Psychology Insulin-Like Growth Factor I - biosynthesis Insulin-Like Growth Factor I - genetics Male marbling monensin Muscle, Skeletal - drug effects Muscle, Skeletal - metabolism Phenethylamines - pharmacology Random Allocation Receptors, Adrenergic, beta - biosynthesis Receptors, Adrenergic, beta - genetics Revalor-S Reverse Transcriptase Polymerase Chain Reaction - veterinary RNA, Messenger - biosynthesis RNA, Messenger - genetics steers Terrestrial animal productions trenbolone acetate and estradiol implant tylosin Vertebrates yearlings
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