Degradabilidade ruminal de coprodutos da industria sucroalcoleira

Abstract

The by-products generated in the sugar and alcohol industries are presented as alternatives for use in animal nutrition, in order to reduce food costs and use the excess of generated by-products. The objective of this work was to evaluate the in situ degradability of yeast and sugarcane bagasse. The TNT bags were introduced directly into the rumen in 20x20 fillet bags tied in a 1.5m nylon line, in descending order of 192, 96, 48, 24, 12, 6, 3 and 0 hours, each bag of filo had 32 bags of TNT in duplicates in the animal and incubation time. To estimate the kinetic parameters of MS and NDF, the first-order asymptotic model was used: DP = a + b(1-e-ct); where DP is the potential ruminal degradability of food; “a” is the soluble fraction; “b”, the potentially degradable fraction of the insoluble fraction that would be degraded at a rate “c”; “c”, which would be the degradation rate of fraction “b”; and "t" the incubation time in hours. The fibrous content of sugarcane bagasse was much higher than that of yeast, being 89.06, 56.98 and 30.82 of neutral detergent fiber, acid detergent fiber and lignin respectively, compared to yeast that was 39.90, 11.56 and 5.08 respectively. The degradability of both dry matter and NDF was higher in yeast in all incubation periods, which is related to the fibrous content of the food. Based on the results obtained, yeast presents itself as a better alternative for inclusion in ruminant feed.