Abstract
Rodríguez-Gaxiola, M. A., Domínguez-Vara, I. A., Barajas-Cruz, R., Mariezcurrema-Berasain, M. A., Bórquez-Gastelum, J. L. and Cervantes-Pacheco, B. J. 2015. Effects of zilpaterol hydrochloride and zinc methionine on growth performance and carcass characteristics of beef bulls. Can. J. Anim. Sci. 95: 609–615. Sixty beef bulls with a body weight (BW) of 314.7±16.2 kg were used to evaluate the effects of zilpaterol hydrochloride (ZH) and zinc methionine (ZM) on growth performance and carcass characteristics. The experimental design was a randomized complete block, with a factorial 2×2 arrangement of treatments (ZH: 0 and 0.15 mg kg−1BW; ZM: 0 and 80 mg kg−1dry matter). The ZH increased (P<0.05) the final BW, average daily gain, feed conversion, carcass yield and longissimus dorsi area. Bulls fed ZH plus ZM had less (P<0.01) backfat thickness and intramuscular fat (IMF) compared with those fed ZH or ZM alone. The ZH increased (P<0.02) the meat crude protein content and cooking loss. It is therefore concluded that ZH increases growth performance, carcass yield, longissimus dorsi area, and meat crude protein. The interaction of ZM and ZH did not present additional advantages. The reason for the reduction in backfat thickness and IMF by ZH plus ZM is unclear, and implies that our knowledge of β-agonistic adrenergic substances and their interactions with minerals is incomplete.
Highlights
Impact on the satisfaction of beef consumers is tenderness and because this can be enhanced by an increased intramuscular fat (IMF) content (Brooks et al 2010), it is important to look for alternatives that allow an increase intramuscular meat fat (IMF) in beef cattle fed Zilpaterol hydrochloride (ZH)
Our hypothesis is that ZH plus zinc methionine (ZM) may increase the growth performance, IMF, meat tenderness and carcass characteristics of beef bulls
The objective of this study was to evaluate the effects of zilpaterol hydrochloride and zinc methionine on the growth performance and carcass characteristics of beef bulls
Summary
Les effets du chlorhydrate de zilpaterol et de la methionine de zinc sur les performances de croissance et caracteristiques de carcasse des taureaux de boucherie. On peut conclure que le ZH augmente la performance de croissance, le rendement de la carcasse, l’aire du muscle longissimus dorsi et le taux de proteines brutes de la viande. Zilpaterol hydrochloride (ZH) is an adrenergic b-agonist that in some countries, such as Mexico, the United States, South Africa and Canada, is used as a feed additive to increase the carcass dressing of beef cattle (Delmore et al 2010). Our hypothesis is that ZH plus zinc methionine (ZM) may increase the growth performance, IMF, meat tenderness and carcass characteristics of beef bulls. The objective of this study was to evaluate the effects of zilpaterol hydrochloride and zinc methionine on the growth performance and carcass characteristics of beef bulls
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