title: Effects of implant regimens (trenbolone acetate-estradiol administered alone or in combination with zeranol) and vitamin D3 on fresh beef color and quality.
abstract: In the first oftwo experiments, 123 calf-fed steers were used over a 2-yr period to evaluate the effects of trenbolone acetate (TBA)-based implants administered alone or in combination with zeranol implants on fresh beef muscle quality, color, and physiological maturity of the carcass. Implant treatments decreased (P < 0.05) a* values (d 0 and d 3 of retail display) and b* values (d 0, d 1, and d 3 of retail display) after 14 d of aging. Carcasses from cattle initially implanted with Revalor-S and reimplanted with Revalor-S on d 60 of the finishing period showed increased lean and bone maturity scores and ash content of the 9th to 11th thoracic buttons and Warner-Bratzler shear force values (WBS) compared to those initially implanted with Ralgro and subsequently reimplanted with Revalor-S or control cattle. In addition, implants decreased (P < 0.05) marbling, percentage of the carcasses grading Choice, and kidney, pelvic, and heart fat (KPH). Implant treatments increased (P < 0.05) ADG, hot carcass weights, and longissimus muscle (LM) area. In the second experiment over a 2-yr period, 166 steers fed as yearlings were allotted to one of two implant treatments and one of two vitamin D3 preharvest supplementation treatments. Implanted steers had heavier (P < 0.05) final body weights and higher (P < 0.05) ADG, less (P < 0.05) KPH fat, and larger (P < 0.05) LM. Also, implanted steers had more (P < 0.05) advanced bone maturity scores, higher (P < 0.05) ash content of the 9th to 11th thoracic buttons, and higher (P < 0.05) WBS values on 5-d postmortem loin steaks. Vitamin D3 feeding decreased (P < 0.05) final live weight, ADG (P < 0.05), and LM (P < 0.05), but did not significantly improve WBS values. In Experiment 2, neither implant treatment nor vitamin D3 supplementation had significant effects on L*, a*, or b* values of muscles in steaks before or during simulated retail display.
authors.affiliation: Department of Animal Sciences, University of Florida, Gainesville 32611-0910, USA.
authors.forename: B A
authors.initials: BA
authors.lastname: Reiling
authors.forename: D D
authors.initials: DD
authors.lastname: Johnson
mesh_terms: D000284:Administration, Oral; D045930:Anabolic Agents / Q000008:administration & dosage* / Q000494:pharmacology; D000818:Animals; D001823:Body Composition / Q000187:drug effects*; D001835:Body Weight / Q000187:drug effects; D002417:Cattle / Q000254:growth & development*; D002762:Cholecalciferol / Q000008:administration & dosage* / Q000494:pharmacology; D004338:Drug Combinations; D004343:Drug Implants; D004958:Estradiol / Q000008:administration & dosage; D004968:Estrogens, Non-Steroidal / Q000008:administration & dosage* / Q000494:pharmacology; D008297:Male; D008460:Meat / Q000592:standards*; D010858:Pigmentation / Q000187:drug effects; D011897:Random Allocation; D014204:Trenbolone Acetate / Q000008:administration & dosage / Q000031:analogs & derivatives*; D015029:Zeranol / Q000008:administration & dosage
chemical_list: D045930:Anabolic Agents; D004338:Drug Combinations; D004343:Drug Implants; D004968:Estrogens, Non-Steroidal; D002762:Cholecalciferol; D004958:Estradiol; D015029:Zeranol; D014204:Trenbolone Acetate