MÃTODOS DE DETERMINAÃÃO E EFEITO DA CONCENTRAÃÃO DE ÃCIDOS FENÃLICOS NA DEGRADABILIDADE DE COASTCROSS / Methods of determination and effects of the concentration of phenolic acids in the coast cross grass degradation

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The digestion of the cell wall of forage plants shows closely associatedto its chemical composition.Of the components of cell wall, lignin is considered the one which shows the highest negative effects on ruminal digestion. The concentration of lignin present in the cell was is not enough to account for the variations in the digestion of forages. The arrangement of lignin and its precursors, in particular acids p-coumaric and pherulic, along with the other components of the cell wall have an effect on a great pat of the limitations found in the digestion of forages. The work was accomplished in the Animal Science Departament of the Federal University of Lavras, in the period of November/2006 to February/2007, with the objetive of determining the degradability of coast cross grass hay at different growth stages, relating them to te concentrations of phenolic acids found in the grass. The utilizad desing was in completely randomized in a factorial scheme 4 x 3 (4 age x 3 extraction methods) with 4 replicates. The age of the grass influenced the chemical composition and degradation of neural detergent fiber (NDF) as well as in the concentration of p-coumaric acid. The contents of dry mater (DM), crude protein (CP), ether extract (EE), mineral matter (CZ), neutral detergent fiber (NDF), nitrogen in neural detergent fiber (NNDF), nitrogen in acid detergent fiber (ANDF) and soluble nitrogen (NSOL) increased and acid detergent fiber (ADF) decreased with advancing age. The degrability od NDF decreased with the advance of the age. The content of p-coumaric acid decreased with increasing age of the grass and did not influence degradability.

ASSUNTO(S)

zootecnia

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