Produção de gás in vitro em substratos com níveis de coprodutos do biodiesel e capim brachiaria.

Abstract

Aimed to evaluate the degradability, gas production and the production of VFA and methane in vitro of the biodiesel industry by-products (canola, oilseed radish, sunflower, and castor) replacing Brachiaria grass, developed after 48 hours incubation in culture in vitro gas production in four levels (0, 30, 50 and 70%). The inoculum for in vitro incubation was obtained three Holstein cows with rumen fistulas. The experimental design was completely randomized in a factorial arrangement 4x 4, with the factors represented by the by-products and levels. According to the results all by-products studied had a significant effect (P <0.05) by levels of diets. The canola by-product to the end of incubation showed higher degradation compared to the other by-products, but showed high gas production, thus being the most efficient by-product. And the lower degradability was obtained with the by-product of castor oil. The evaluated by-products can be used in the diet of ruminants with protein potential suppliers, providing better energy utilization. With regard to gas production, to replace the grass Brachiaria by by-products, was increased production of these not being, but their use impractical to increase dietary energy without causing metabolic disorders. Being the by-product of canola showed the highest production, while the lowest production was observed with the by-product of castor oil.