性能完成牛肉引导反应合成盐酸植入和zilpaterol补充。

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帕尔SL,涌肯塔基州,Galyean ML, Hutcheson JP,劳伦斯N,黑尔斯克,5毫升,奎因MJ,史密斯博士,约翰逊BJ

性能完成牛肉引导反应合成盐酸植入和zilpaterol补充。

J动物科学。2011年2月,89 (2):560 - 70。doi: 10.2527 / jas.2010 - 3101。Epub 2010年10月8日。

PubMed ID

20935134 (在PubMed

]

文摘

我们的目标是评估的剂量/支付模式trenbolone醋酸(稍后通知)和estradiol-17beta (E(2))的植入物和喂养zilpaterol盐酸盐(ZH型)性能和胴体加工牛肉的特点引导。随机完全区组设计是使用3 x 2的阶乘安排治疗。英国x大陆引导(n = 168;最初的BW = 362公斤)被BW和随机分配到42笔(7笔/治疗;6笔/块;4引导/笔)。治疗的主要影响植入(没有植入(NI);Revalor-S (REV-S;120毫克的稍后通知+ 24毫克的E (2));和Revalor-XS (REV-X; 200 mg of TBA + 40 mg of E(2))] and ZH (0 or 8.3 mg/kg of DM for 20 d with a 3-d withdrawal before slaughter). Blocks were split into 2 groups, and block groups were fed for either 153 or 174 d. No implant x ZH interactions were noted for cumulative performance data. Overall, shrunk final BW (567, 606, and 624 kg for NI, REV-S, and REV-X, respectively), ADG (1.25, 1.51, and 1.60 kg), and G:F (0.14, 0.16, and 0.17) increased (P < 0.05) as TBA and E(2) dose increased. Implanting increased (P < 0.05) DMI, but DMI did not differ (P > 0.10) between REV-S and REV-X (8.8 for NI vs. 9.4 kg/d for the 2 implants). From d 1 to 112 of the feeding period, implanting increased (P < 0.05) ADG and G:F, but REV-S and REV-X did not differ (P > 0.10). From d 112 to end, ADG increased by 19% (P < 0.05) and G:F was 18% greater (P < 0.05) for REV-X vs. REV-S. Carcass-adjusted final BW (29-kg difference), ADG (0.2-kg/d difference), and G:F (0.02 difference) were increased (P < 0.05) by ZH, but daily DMI was not affected by feeding ZH. Hot carcass weight was increased (P < 0.05) by ZH (19-kg difference) and implant, with REV-X resulting in the greatest response (HCW of 376 for NI vs. 404 and 419 kg for REV-S and REV-X, respectively; P < 0.05). An implant x ZH interaction (P = 0.05) occurred for dressing percent (DP). Without ZH, implanting increased DP, but DP did not differ (P > 0.10) between REV-X and REV-S. With ZH, REV-X increased (1.7%; P < 0.05) DP vs. NI and REV-S. Marbling score, 12th-rib fat, and KPH were not affected (P > 0.10) by implant or ZH. Overall, treatment increased steer performance and HCW in an additive fashion, suggesting different mechanisms of action for ZH and steroidal implants. In addition, a greater dose of TBA + E(2) and extended payout improved steer performance and HCW.

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药物

Zilpaterol