Caracterização do consumo alimentar residual e relações com desempenho e características de carcaça de bovinos nelore

Abstract

Objetivou-se com este trabalho avaliar desempenho, parâmetros de eficiência e correlações fenotípicas entre diferentes medidas de eficiência energética de animais Nelore selecionados para peso pós desmame e classificados quanto ao consumo alimentar residual (CAR). O CAR foi calculado pela diferença entre o consumo observado e o predito, baseado no PV0,75 e ganho médio diário (GMD), sendo os animais classificados como alto CAR (> 0,5 desvio padrão da média - menos eficientes), médio CAR (± 0,5 desvio padrão da média), e baixo CAR ( 0.5 standard deviation - less efficient), medium RFI ( ± 0.5 standard deviation), and low RFI (<0.5 standard deviation - more efficient). There were no differences in initial and final BW, ADG and dry matter intake (DMI) between RFI levels. Low RFI animals also were better in feed efficiency, feed conversion and partial efficiency of growth and were not different of relative growth rate and Kleiber ratio. RFI was correlated with feed efficiency (-0.25), feed conversion (0.25), partial efficiency of growth (-0.37) and DMI (0.16), and was not significantly correlated with BW (0.04 ), ADG (-0.02), relative growth rate (-0.03) and Kleiber ratio (-0.05). Significant correlations between feed conversion and initial BW (0.34) and ADG (-0.46) were detected. Partial efficiency of growth was correlated to all the others efficiency parameters analyzed. RFI, when compared to other energy efficiency measures, has great potential in productive efficiency, without affecting growth and size of animals.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES