Effects of the Duration of Zilpaterol Hydrochloride Supplementation and Days on Feed on Performance, Carcass Traits and Saleable Meat Yield of Nellore Bulls

Autor(es)

Caetano, Mariana ^[1] ; Goulart, Rodrigo S. ^[2] ; Silva, Saulo L. ^[2] ; Leme, Paulo R. ^[2] ; Pflanzer, Sergio B. ^[3] ; dos Santos, Antonio C. R. ^[4] ; Lanna, Dante P. D. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Adelaide, Davies Livestock Res Ctr, Sch Anim & Vet Sci, Dept Anim & Vet Biosci, Roseworthy Campus, Roseworthy, SA 5371 - Australia

^[2] Univ Sao Paulo, Coll Anim Sci & Food Engn, Dept Anim Sci, BR-13635900 Pirassununga, SP - Brazil

^[3] Univ Estadual Campinas, Fac Food Engn, Dept Food Technol, BR-13083862 Campinas, SP - Brazil

^[4] Univ Sao Paulo, Coll Agr, Dept Anim Sci, BR-13418900 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ANIMALS; v. 11, n. 8 AUG 2021.
• Citações Web of Science: 0

Resumo

Simple Summary Zilpaterol hydrochloride (ZH) is a beta-adrenergic agonist (beta AA) to be feed to feedlot cattle at a rate of 8.3 mg/kg during the final 20 to 40 d of the finishing period followed by a minimum 3 d withdrawal period. This compound has the potential to increase animal performance, improve carcass weight and meat yield. Although significant information regarding the effects of duration of ZH supplementation and days on the feed of Bos taurus cattle has been provided, there is a lack of information relative to its effects on Bos indicus breeds such as Nellore cattle. The current study aimed to evaluate the effects of the duration of ZH supplementation and DOF on performance, carcass characteristics, and saleable meat yield of Nellore bulls. The HCW and total saleable meat yield linearly increased with the duration of ZH supplementation as well as when the length of the feedlot period increased. We recommend supplementing ZH for Nellore bulls at least for 20 days, independently of days on feed, to improve hot carcass weight, hindquarter, and saleable meat yields of Nellore bulls. This study evaluated the effects of the duration of ZH supplementation and days on feed (DOF) on performance, carcass characteristics, and saleable meat yield of Nellore young bulls. The fixed effects included the duration (0, 20, 30, or 40 d before slaughter plus a 3 d ZH withdrawal period-8.33 mg of ZH/kg of DM) and DOF (90 and 117 d). Feed efficiency (G:F) linearly increased when the duration of ZH supplementation increased (p < 0.01). Nellore bulls fed ZH had greater HCW (p < 0.01), dressing percentage (p < 0.01) and Longissimus muscle area (LMA) (p < 0.01), but less 12th-rib fat (p = 0.04) than the control group. The hot carcass weight (HCW) (p < 0.01), and dressing percentage increased linearly (p < 0.01) with the increase of duration of ZH supplementation. The HCW, ossification, and 12th-rib fat increased with DOF (p < 0.01). The ZH supplemented group had most of the individual cuts of hindquarters and total saleable meat increased compared with the control. Zilpaterol hydrochloride was effective in improving hot carcass weight, hindquarter, and saleable meat yields of Nellore bulls when fed for at least 20 d before slaughter, independently of days on feed. (AU)

• Processo FAPESP: 13/04733-2 - Efeito do tempo de tratamento com zilpaterol e do período de confinamento no desempenho, características de carcaça e qualidade de carne de bovinos Nelore
• Beneficiário: Dante Pazzanese Duarte Lanna
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 12/14997-4 - Efeitos do período de administração de cloridrato de zilpaterol e do tempo de confinamento no desempenho, características de carcaça e qualidade de carne de bovinos Nelore
• Beneficiário: Antonio Carlos Ramos dos Santos
• Modalidade de apoio: Bolsas no Brasil - Mestrado