Composição química e características fermentativas in vitro da glicerina em substituição a diferentes forragens.

Abstract

This study aimed to evaluate the effect of glycerin instead to usual fodder sources in the diet of ruminants. Through the parameters of gas production with rumen degradability, pH value, the total gas production, production of volatile fatty acids, ammonia nitrogen content of four forage species on the effect of substitution with the byproduct of biodiesel, glycerin, through the use of semi- automated technique of gas production in vitro is using a statistical design with 4 treatments and 4 replicates. The treatments were the replacement of glycerin by increasing levels 0%, 30% 50% and 70% of the forage: Elephant Grass, cane sugar, corn silage and Brachiaria grass. Within the levels of glycerin, the higher the higher its replacement was dry matter degradability. The meaus of the total gas production for the sugar cane and elephant grass fluctuated between levels, which showed higher values for the 50% level. The methane mitigation this study the effect of glycerin Brachiaria provided with a positive effect to the environment. The Brachiaria and Elephant grass played for the variables of production of methane, carbon dioxide and ammonia nitrogen a positive effect on the quality of the forage with glycerin. The production of acetate, with the addition of glycerin values decreased, with the exception of Elephant grass, which increased their percentage to the level of 50%. Increasing amounts of butyric and propionic acid can occur when the diet is rich in cereals. Glycerin can be recommended to 30%, based on dry matter of Elephant and Brachiaria grass and played, respectively, great use of the effect of glycerin. And the elephant grass has had a positive effect on forage quality with glycerin, for the production of volatile fatty acids.