Effect of zilpaterol hydrochloride on growth performance and carcass characteristics of wether goats

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• 作者：M.A. L贸pez-Carlos ; J.I. Aguilera-Soto ; R.G. Ram铆rez ; H. Rodr铆guez ; O. Carrillo-Muro ; F. M茅ndez-Llorente
• 关键词：Wether goats ; Zilpaterol ; Growth performance ; Carcass characteristics
• 刊名：Small Ruminant Research
• 出版年：April, 2014
• 年：2014
• 卷：117
• 期：2-3
• 页码：142-150
• 全文大小：689 K

文摘

Zilpaterol hydrochloride (ZH) supplementation was evaluated on performance of growing goats for the last 42 days before slaughter. Forty-eight Anglo-Nubian 脳 Criollo animals (12 per treatment) were randomly assigned to one of four treatments (ZH at daily doses of 0.0, 0.1, 0.2 or 0.3 mg/kg of BW in diet) in a complete block design. Basal diet contained 16.3% CP and 2.5 Mcal/kg ME. The ZH supplementation at doses of 0.1, 0.2 and 0.3 mg/kg of BW increased ADG by 22.1, 54.0 and 56.6%, and gain/feed ratio by 20.0, 40.0 and 60.0%, respectively. The DMI (g/kg of BW^0.75) increased quadratically (P = 0.037). Carcass weight and dressing percentage (DP) augmented linearly (P 鈮?#xA0;0.031) as level of ZH increased in diet. The ZH supplementation increased (P 鈮?#xA0;0.023) longissimus muscle area (LM) and leg perimeter (LP) with a linear improvement (P < 0.001) of LM area by 12.2% and 21.0% as ZH level increased in diet. The neck perimeter (NP) observed a quadratic trend (P < 0.035) with greater values at 0.1 and 0.2 mg/kg of ZH. For each increment of 0.1 mg/kg in the ZH level, the percentage of fat in kidney, heart and pelvis tended to decrease by 4% (P = 0.089). Other carcass characteristics were not significantly affected (P 鈮?#xA0;0.311) by ZH administration, but tended to reduce (P 鈮?#xA0;0.094) redness (a*) and chroma (C*) values in the longissimus muscle. It was observed a linear tendency to diminish pH (P = 0.072). However, no differences (P > 0.05) or trends (P > 0.10) were detected on purge loss (PL) or cooking loss (CKL). Growth differences between wether goats fed ZH doses of 0.2 or 0.3 mg/kg of BW were small, and therefore lower dose of 0.2 mg/kg of BW seems enough to enhance growth. Moreover, the carcass characteristics showed minor differences between levels of ZH supplementation, and therefore could be considered that the lower dose of 0.1 mg/kg of BW of ZH was sufficient to improve these traits. It is concluded that addition of ZH to diets of wether goats increased growth performance and carcass characteristics in a similar manner to that reported for cattle and sheep.