Supplementation of Sorghum Silage with Different Sources of Protein for Beef Cattle

[摘要] - Soybean meal (SBM), feather meal (FTM) and treated soybean meal (TSBM) with 0.17% of formaldehyde were used as supplement of sorghum silage to evaluate the effect on intake, performance and nutrient digestibilities with young bulls. Treatment of soybean meal with formaldehyde did not differ from soybean not treated, for all studied parameters. Feather meal supplement presented lower digestibility coefficients for DM, OM, CP, NDF and ADF (63.0, 65.5, 61.8, 56.4, and 50.9%, versus 65.1, 67.0, 66.8, 58.5, and 53.6% for soybean meal and 66.7, 68.7, 67.2, 61.9 and 57.5% for treated soybean meal, respectively). It also showed lower metabolizable energy intake by unit of metabolic weight (214 kcal/MW for FTM, 234 kcal/MW for SBM and 240 kcal/MW for TSBM). Even if differences were observed for all parameters, it was not possible to detect differences in live weight gain (1.5, 1.6 and 1.7 kg/d for FTM, SBM and TSBM).

[学科分类] 兽医学

[关键词] intake;digestibility;liveweight gain;young bulls     IntroduçãoA suplementação protéica de baixa degradabilidade ruminal a bovinos jovens;alimentados com gramíneas fermentadas;tal como a silagem de sorgo;visando melhorar o desempenho animal;já foi objeto de inúmeros estudos (Kaufmann & Lupping;1982; Orskov;1988; Blasi et al