首页> 外文期刊>Journal of Animal Science >Effects of dietary zilpaterol hydrochloride on feedlot performance and carcass characteristics of beef steers fed with and without monensin and tylosin
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Effects of dietary zilpaterol hydrochloride on feedlot performance and carcass characteristics of beef steers fed with and without monensin and tylosin

机译:日粮盐酸齐帕特罗对有莫能菌素和泰乐菌素进食和不进食莫能菌素和泰乐菌素的肉牛肥育性能和car体特性的影响

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摘要

A feedlot experiment was conducted under commercial conditions in the Texas Panhandle using 3,757 feedlot steers (average of 94 steers/pen) to evaluate the effects of feeding zilpaterol hydrochloride with or without monensin and tylosin on feedlot per- formance and carcass characteristics. The experiment was conducted using a randomized complete block design. Treatments were arranged as a 2 (no zilpaterol vs. zilpaterol) x 2 (monensin and tylosin withdrawn vs. monensin and tylosin fed during the final 35 d on feed) factorial. Steers were fed for a total of 161 to 167 d, and treatments were administered during the final 35 d that cattle were on feed. When included in the diet, zilpaterol, monensin, and tylosin were supplemented at 8.3, 33.1, and 12.2 mg/kg (DM basis), respectively. Zilpaterol was included in the diet for 30 d at the end of the finishing period and withdrawn from the diet for the last 5 or 6 d cattle were on feed. Cattle were harvested and carcass data collected. There were no zilpaterol x monensin/tylosin interactions (P ≥ 0.12) for ADG or G:F. Feeding zilpaterol increased ADG (P < 0.001) by 0.20 kg and G:F (P < 0.001) by 0.029 kg/kg during the last 35 d on feed. Likewise, when feedlot variables were measured throughout the entire 161- to 167-d feeding trial, ADG (3.4%; P < 0.001) and G:F (3.9%; P < 0.001) were increased. Feeding zilpaterol increased (P < 0.00 1) dressing percent and HCW and decreased (P < 0.001) total liver abscess rate compared with controls. In addition, zilpaterol increased (P < 0.001) LM area by an average of 8.0 cm2. There was a zilpaterol x monensin/tylosin interaction (P = 0.03) for marbling score. Zilpaterol decreased (P < 0.001) marbling score regardless of monensin and tylosin treatment, although withdrawal of monensin and tylosin for 35 d decreased marbling to a greater extent (31 vs. 17 degrees). Zilpaterol decreased (i.e., improved; P < 0.001) calculated yield grade regardless of monensin and tylosin treatment, but feeding zilpaterol in combination with the withdrawal of monensin and tylosin for 35 d decreased calculated yield grade to a greater extent (0.49 vs. 0.29) compared with the zilpaterol, monensin, and tylosin combination treatment (zilpaterol x monensin/tylosin interaction, P 0.03). Results suggest that monensin and tylosin can be withdrawn from the diet during the zilpaterol feeding period (final 35 d on feed) with minimal effect on animal performance, although feeding zilpaterol in combination with monensin and tylosin seemed to moderate effects on carcass quality. [PUBLICATION ABSTRACT]
机译:在德州Panhandle的商业条件下,使用3,757个育肥场ste牛(平均94 ers /笔)进行了育肥场实验,以评估饲喂含或不含莫能菌素和泰乐菌素的盐酸齐帕特罗对育肥场性能和car体特性的影响。使用随机完整模块设计进行实验。处理安排为2(无齐帕特罗vs.齐帕特罗)x 2(停用莫能菌素和泰乐菌素与进食最后35天喂养的莫能菌素和泰乐菌素)因子。饲养公牛的时间总计为161至167天,并在最后35天的牛饲养过程中进行了处理。当包括在饮食中时,分别以8.3、33.1和12.2 mg / kg(以DM为基准)补充齐帕特罗,莫能菌素和泰乐菌素。在肥育期结束时,在饲料中加入齐帕特罗30 d,并在最后5或6 d牛从饲料中退出日粮。收获牛并收集car体数据。 ADG或G:F无齐帕特罗x莫能菌素/泰乐菌素相互作用(P≥0.12)。在饲料的最后35天中,饲喂齐帕特罗可增加ADG(P <0.001)0.20 kg / kg和G:F(P <0.001)0.029 kg / kg。同样,在整个161天至167天的饲喂试验中都对饲养场变量进行测量时,ADG(3.4%; P <0.001)和G:F(3.9%; P <0.001)有所增加。与对照组相比,饲喂齐帕特罗可增加(P <0.00 1)换药率和HCW,降低总肝脓肿率(P <0.001)。此外,齐帕特罗使LM面积平均增加(P <0.001)8.0 cm2。大理石花纹分数存在齐帕特罗x莫能菌素/泰乐菌素相互作用(P = 0.03)。无论莫能菌素和泰乐菌素治疗如何,齐帕特罗都能降低(P <0.001)大理石花纹得分,尽管停药莫能菌素和泰乐菌素35 d可以更大程度地降低大理石花纹(31 vs. 17度)。无论莫能菌素和泰乐菌素处理如何,齐帕特罗均降低(即改善; P <0.001)计算的产量等级,但是饲喂齐帕特罗与莫能菌素和泰乐菌素的撤药相结合35 d降低了计算的产量等级(0.49 vs. 0.29)与齐帕特罗,莫能菌素和泰乐菌素联合治疗相比(齐帕特罗x莫能菌素/泰乐菌素相互作用,P = 0.03)。结果表明,在齐帕特罗喂养期间(最后35 d),可以从日粮中提取莫能菌素和泰乐菌素,对动物的生产性能影响最小,尽管与齐莫特罗和泰乐菌素联合饲喂齐帕特罗对seemed体品质影响不大。 [出版物摘要]

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