Fracionamento de carboidratos e degradabilidade ruminal da cana-de-a???§???ocar tratada com ???3xido de c????lcio

摘要

Were evaluated the fractioning of carbohydrates and in situ dry matter (DM) and neutral detergent fiber (NDF) of sugarcane treated with calcium oxide (Ca O). Levels 0, 0.75, 1.5, 2.25, 3.0, 3.75 and 4.5% Ca O, and the material witness (sugarcane in nature) were tested for the assessment of fractioning of carbohydrates and levels 0, 1.5, 3.0 and 4.5% Ca O for the evaluation of in situ DM and NDF. The levels of Ca O were added in powder form, as a percentage of natural matter in sugarcane for 24 hours. The inclusion levels of Ca O in sugarcane showed lower values for the total carbohydrates (TC) when compared with sugarcane in natura. A linear growth of the fractions A + B1 and B2 was observed, as well as a decrease in C fraction of sugarcane depending on the levels of Ca O. The highest values of insoluble fraction potentially degradable in rumen and the lower values of NDF indigestible fraction (Ip) were observed in sugarcane with 3.0 and 4.5% Ca O. The addition of 3.0 and 4.5% Ca O to sugarcane decreased the indigestible carbohydrates fraction and promotes better rates of ruminal degradation of both DM and NDF.