title: Anabolic implant effects on steer performance, carcass traits, subprimal yields, and longissimus muscle properties.
abstract: Crossbred steers (n = 140; 353 kg) were implanted as follows: (C) control, no implant; (S) Synovex-S (20 mg estradiol benzoate + 200 mg progesterone); (R) Revalor (20 mg estradiol + 140 mg trenbolone acetate [TBA]; international dosage); (ST) S + finaplix-S (140 mg TBA); (STT) S + finaplix-S with finaplix-S reimplanted on d 58. Steers were harvested after 119 to 126 d on feed. Left sides of 40 carcasses were fabricated into boneless subprimals for two s.c. fat levels: 2.5 and .64 cm. Steers administered an estrogen (estradiol benzoate or estradiol) plus TBA gained more rapidly (P < .05) than C or S steers. Feed efficiency was improved (P < .05) with an estrogen plus TBA. No differences (P > .05) were noted among treatments for carcass s.c. fat thickness, percentage internal fat, or lean color. Carcasses from steers receiving TBA had larger (P < .05) longissimus areas and tended to have lower (P < .10) marbling scores and yield grades than C or S steers. Steers implanted with R had a lower (P < .05) percentage of U. S. Choice carcasses (51.8%) than C, S, and ST steers (82 to 86%). Shear force values for implanted steers tended to be higher (P < .10) than for controls. Implants increased (P < .05) subprimal and total side lean yields (.64 cm) compared to controls; the largest increases of 2.3 and 2.8%, respectively, occurred in steers receiving TBA plus an estrogen. Estrogen plus TBA exhibited favorable effects on gain, efficiency, and composition; however, the single estradiol plus TBA implant (R) decreased quality grade.
authors.affiliation: Department of Animal Science, Oklahoma Agricultural Experiment Station, Stillwater 74078-6051, USA.
authors.forename: C P
authors.initials: CP
authors.lastname: Foutz
authors.forename: H G
authors.initials: HG
authors.lastname: Dolezal
authors.forename: T L
authors.initials: TL
authors.lastname: Gardner
authors.forename: D R
authors.initials: DR
authors.lastname: Gill
authors.forename: J L
authors.initials: JL
authors.lastname: Hensley
authors.forename: J B
authors.initials: JB
authors.lastname: Morgan
mesh_terms: D045930:Anabolic Agents / Q000008:administration & dosage / Q000494:pharmacology*; D000818:Animals; D001823:Body Composition / Q000187:drug effects* / Q000502:physiology; D001835:Body Weight / Q000502:physiology; D002417:Cattle / Q000254:growth & development* / Q000502:physiology; D003296:Cooking; D004338:Drug Combinations; D004343:Drug Implants; D004958:Estradiol / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology*; D005524:Food Technology / Q000379:methods; D006863:Hydrogen-Ion Concentration; D008297:Male; D008460:Meat / Q000592:standards*; D018482:Muscle, Skeletal / Q000187:drug effects* / Q000502:physiology; D011374:Progesterone / Q000008:administration & dosage / Q000494:pharmacology*; D014204:Trenbolone Acetate / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D045930:Anabolic Agents; D004338:Drug Combinations; D004343:Drug Implants; D011374:Progesterone; D004958:Estradiol; C025370:estradiol benzoate, progesterone drug combination; D014204:Trenbolone Acetate