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Abstract
Salinas-Chavira, J., García-Barrera, L. A., Cruz-Bautista, H., Montaño-Gómez, M. F. and Calderón-Cortés, J. F. 2005. Effect of ionophore supplementation and trenbolone implant on growth and carcass characteristics of lambs. J. Appl. Anim. Res., 28: 49–52.
To study the effect of ionophore (monensin) and trenbolone implant on feedlot lamb growth performance (60 d) and carcass characteristics, 18 intact males (Pelibuey × Dorper 19.9±2.25 kg) were housed in individual pens and assigned to 3 treatments viz. Tl: no additive nor implant (control), T2: basal diet (14% CP and 2.6 Mcal/kg ME) with ionophore (25 ppm sodium monensin) supplementation and T3: T2 plus implant (35 mg of trenbolone acetate + 5 mg of 17-β estradiol). No differences (P>0.05) were found among treatments for daily dry matter intake, daily weight gain, feed efficiency and subcutaneous fat. Longissimus dorsi area was similar in T2 and T3 (P>0.05) but higher than that in Tl (P<0.05). Ionophore alone or with implant did not improve feedlot lamb performance (P<0.05) or subcutaneous fat, but had beneficial effect on Longissimus dorsi area. Implant in addition to ionophore did not cause any further improvement.