Endocrine Abstracts (2011) 26 P657

Zilpaterol hydrochloride (a [beta]-agonist) improve growth performance and carcass quality in castrated goat

A Towhidi, A Hatefi, S Zeinoaldini, A Zali & M Ganjkhanlou

Department of Animal Science, University of Tehran, Karaj, Alborz, Islamic Republic of Iran.

The aim of this study was to investigate the effect of Zilpaterol hydrochloride (a β-agonist) on growth performance and carcass quality in goats. 14 Mahabadi castrated male goats with 6 months old were selected and assigned in two groups. The animals in both groups were fed with finishing diet (2.35 Mcal ME/kg and 15.23% CP). The goats in treated group were received 0.2 mg/kg per live body Zilpaterol hydrochloride (Zilmax, Intervet South Africa) for 30 days with 3 days as withdrawn period. Data were analyzed by proc GLM in SAS. Zilpaterol hydrochloride decreased dry matter intake (P<0.05) while increased average daily gain (P<0.05) and total live body weight (P<0.05) at the end of feedlot period. As a result, this β agonist caused to improve feed efficiency. Zilmax increased hot carcass weight (P<0.05) and longissimus muscle area (LM) (P<0.05) and decreased back fat thickness (P<0.05). Carcass dressing percentage tended to increase (P=0.064) in treated group. Results suggest that Zilpaterol hydrochloride could improve feedlot performance and carcass quality in castrated goats.

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