Using zilpaterol in an intensive feeding system for steers in Yucatán, México.

  • Arturo Francisco Castellanos-Ruelas Fac. de Ing. Química. Univ. Aut. Yucatán
  • A. Peón-Cámara Fac. de Ing. Química. Univ. Aut. Yucatán

Abstract

The effect of zilpaterol, which is sold legally in Mexico, on growth and carcass yield and composition of zebu-type crossbred steers, was studied during the summer season in Mérida. A commercial product with a concentration of 4.8% of zilpaterol chlorhydrate was used, two treatments being randomly assigned to 95 finishing steers: control (C) and zilpaterol-treated (Z), during 33 days. All animals received the same finishing diet, composed of ground corn grain, soybean hulls, soybean meal, wheat bran, corn stalks, vegetable oil, and a vitamin-mineral premix (1.93 Mcal NEm and 1.29 Mcal NE g/kg; 13.2% CP). Post-slaughter warm and chilled carcass weights, and weight of internal fat were recorded. Fat thickness, area of the Logissimus muscle and marbling were measured between the 12th and 13th ribs. Carcass yield and yield grade were calculated. Steers in the Z group grew 3.1% faster and had heavier and leaner carcasses than those of the C group (P < 0.005). It was concluded that use of oral zilpaterol (0.14 mg/kg bodyweight daily equivalent) in finishing zebu-type steers, stimulates faster grains in weight of whole body and carcass and provides a more desirable carcass composition. (In Spanish).

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Author Biographies

Arturo Francisco Castellanos-Ruelas, Fac. de Ing. Química. Univ. Aut. Yucatán
Médico Veterinario Zootecnista egresado de la Univesidad Nacional Autónoma de México, en 1994. Dr Ing en Ciencias Agronómicas egresado del Instituto Nacional Agronómico de París-Griñon, de París Francia en 1979. Actualmente es Coordinador de Investigación y Posgrado de la Facultad de Ingeniería Química de la Univ. Autónoma de Yucatán en Mérida, Yuc., México. Tiene mas de 50 artículos publicados en revistas científicas arbitradas; mas de 100 participaciones en congresos nacionales e internacionales de profesionistas; veinte tesis asesoradas de licenciatura y maestría en ciencias; imparte cátedra a nivel de licenciatura y maestría; ha conducido numerosos proyectos de investigación. Pertenece al Sistema Nacional de Investigadores de México.
A. Peón-Cámara, Fac. de Ing. Química. Univ. Aut. Yucatán
Químico Farmaco Biólogo egresado de la Universidad Autónoma de Yucatán. Actualmente es candidato a Doctor de la Universidad Complutense de Madrid, España. Profesor-investigador de tiempo completo titular A asignado a la Facultad de Ingeniería Química de la UADY.
Published
2006-07-03
How to Cite
Castellanos-Ruelas, Arturo Francisco, and A. Peón-Cámara. 2006. “Using Zilpaterol in an Intensive Feeding System for Steers in Yucatán, México.”. Archivos Latinoamericanos De Producción Animal 14 (2). https://ojs.alpa.uy/index.php/ojs_files/article/view/361.
Section
Original paper