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10 August 2015 Effects of zilpaterol hydrochloride and zinc methionine on growth performance and carcass characteristics of beef bulls
Miguel A. Rodríguez-Gaxiola, Ignacio A. Domínguez-Vara, Rubén Barajas-Cruz, María A. Mariezcurrema-Berasain, José L. Bórquez-Gastelum, Billy J. Cervantes-Pacheco
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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-1 BW; ZM: 0 and 80 mg kg-1 dry 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 ß-agonistic adrenergic substances and their interactions with minerals is incomplete.

Miguel A. Rodríguez-Gaxiola, Ignacio A. Domínguez-Vara, Rubén Barajas-Cruz, María A. Mariezcurrema-Berasain, José L. Bórquez-Gastelum, and Billy J. Cervantes-Pacheco "Effects of zilpaterol hydrochloride and zinc methionine on growth performance and carcass characteristics of beef bulls," Canadian Journal of Animal Science 95(4), 609-615, (10 August 2015). https://doi.org/10.1139/cjas-2014-175
Received: 16 November 2014; Accepted: 1 July 2015; Published: 10 August 2015
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KEYWORDS
Beef bulls
chlorhydrate de zilpatérol
méthionine de zinc
Taureaux de boucherie
zilpaterol hydrochloride
zinc methionine
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