1Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Tamaulipas, Km 5 Carretera Cd. Victoria a Cd. Mante, Cd. Victoria, Tam. 87000, Mexico.
2Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California. Obregón y Julian Carrillo, Col. Nueva, Mexicali, B.C. 21100, México.
3Centro Universitario del Sur, Universidad de Guadalajara, Ciudad Guzmán, Jalisco, México.
*For correspondence: Calle Ciclamen #2015, Col. Cuauhtemoc, Cd. Victoria, Tam., C.P. 87070. México, E-mail: jsalinasc@hotmail.com
Effect of tallow (Ta) level in rations with rice polishings (RP) on growth and carcass characteristics was studied on twenty one intact males (22.76±3.11kg, Dorper x Pelibuey) housed in individual pens and assigned at random to 3 treatments viz. 0, 2.5 or 5% tallow (ta) replacing equal quantities of sorghum grain and 18% rice polish (RP). Lambs were fed for 60 d on diets formulated to contain 14% CP and 2.6 Mcal/kg ME. No differences (P>0.05) were observed among treatments for daily dry matter intake, daily weight gain, feed efficiency, subcutaneous fat and Longissimus dorsi area. It is concluded that rations for feedlot lambs with 18% of rice polishings may include 5% of tallow, without negative effects on growth or carcass of lambs.
Rice byproduct, growth performance, carcass characteristics, fat, lambs
