Utilização dos grãos secos de destilaria de sorgo mais solúveis em bezerros desmamados precocemente
DOI:
https://doi.org/10.31285/AGRO.28.981Palavras-chave:
grãos de destilaria, bezerros, crescimento, eficiênciaResumo
Avaliou-se o efeito da alimentação de bezerros de desmame precoce com grãos secos de destilaria de sorgo mais solúveis (SDDGS) usados como fonte de energia e proteína numa dieta à base de sorgo grão. Vinte e quatro bezerros castrados (84,6 ± 11,0 kg) foram distribuídos aleatoriamente para quatro rações que diferiam na concentração de SDDGS (0, 130, 260 ou 390 g/kg, base seca), onde SDDGS substituiu uma mistura de sorgo em grão (420 g/kg) e farelo de soja (580 g/kg) procurando similar contribuição de proteína bruta (185 g/kg) e energia metabolizável (12,1 MJ/kg) nas rações. Os animais foram alimentados individualmente ad libitum em três refeições diárias, durante 70 dias. Maior SDDGS na dieta aumentou linearmente o consumo de matéria seca (MS), fibra e gordura (P <0,01), sem afetar o consumo de nitrogênio ou a digestibilidade da MS (P> 0,10). Nenhum efeito (P> 0,10) foi observado no ganho de peso (1,13 kg / d, EP 0,05) ou no peso final (160,0 kg, EP 8,8), mas diminuiu linearmente a eficiência de ganho (EG = −0,0012 × + 0,2679; P <0,01). Não foram detectadas diferenças na atividade de consumo, repouso ou ruminação (P> 0,10). A energia líquida (EN) observada na dieta controle estava abaixo do valor esperado com base nos padrões de alimentação; quando o SDDGS substituiu uma maior proporção de sorgo e farelo de soja na dieta controle, a EN da dieta diminuiu linearmente (P <0,01). A maior taxa de substituição reduziu a EN para manutenção e ganho de peso em 15% e 20%, respectivamente.
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