Correlation between chemical composition and dry matter and neutral detergent fiber in situ degradation of corn hybrids bulky fraction

[摘要] - The chemical composition and in situ dry matter (DM) and neutral detergent fiber (NDF) of bulky fraction (stall and sheets) degradation of 28 corn hybrids in 1996, and 21 hybrids, in 1997, were studied to establish the correlation among the analyzed factors. From the 21 hybrids selected in 1997, 13 were part of the experiment in 1996. The model for the evaluation of in situ DM degradation kinetics (McDonald, 1981), and the model to analyze the in situ NDF degradation kinetics (Mertens and Loften, 1980) were used. Data from both 1966 and 1977 years were analyzed separated or as a set. The bulky fraction effective DM degradation was strongly correlated with the acid detergent fiber (ADF) and NDF content, but it was not correlated with the lignin content. No chemical analysis was correlated with the NDF retention time (Fill), or with the DM and NDF insoluble fraction degradation rate. The ADF content was strongly correlated (R2=0,86) with the DM effective degradation, when both years were analyzed as a set, and could be used as an indicator of bulky fraction DM degradation of corn hybrids.

[学科分类] 兽医学

[关键词] cell wall;fiber;ruminant;corn silage     IntroduçãoA relação entre os constituintes da parede celular e a digestibilidade de forragens é um assunto amplamente abordado pela comunidade científica visando a nutrição de ruminantes