Resumen

MARQUES, J.A. et al. Buffalo heifer's performance fattened in feedlot in response of the utilization of growth promoter or lead sphere introduced in the uterus. Arq. Bras. Med. Vet. Zootec. [online]. 2006, vol.58, n.6, pp. 1132-1138. ISSN 0102-0935.  http://dx.doi.org/10.1590/S0102-09352006000600023.

A completely randomized design with three treatments and seven replicates was used to evaluate the daily weight gain, dry matter intake, feed:weight gain ratio and hot carcass yield of 20 buffalo heifers averaging 350kg and 16 months of age, kept in feed lot for 84 days. Animals were fed on sugar cane silage + 1% of urea and soybean, corn meal and salt minerals. The treatments were EMP - open heifers GPR - growth promoter implanted heifers and LEA - heifers with 100 lead spheres introduced in the uterus. The GRP animals showed higher body weight, daily weight gain and feed:weight gain ratio (444.0kg, 1.2kg and 9.7kg/kg) in comparison to EMP animals (412.6kg, 9kg and 11.4kg /kg) and LEA animals (407.9, 8kg and 12.2kg/kg), respectively. No significant mean differences between EMP and LEA animals for all the studied traits and no treatment effect on carcass yield were observed.

Palabras llave : buffalo; lead sphere; growth promoter; carcass yield.