Efeito de enzimas fibrolíticas sobre a composição bromatológica de silagens de capins tropicais

Abstract

This work was carried out to determine the effect of fibrolytic enzymes levels on the bromatologic composition and in situ degradability of dry matter (DM ) and neutral detergent fibre (NDF) of tropical grasses silage. The experiment consisted of four enzymatic levels (0, 5, 10 and 20 mg of enzymes for kg natural matter), two periods of storage (45 and 120 days) and three repetitions. After the storage, the silos were opened and the content analyzed for dry matter (DM), crude protein (CP), neutral detergent fiber (NDF), ammonia N and pH. In the study of in situ degradability of DM and NDF. It was used the nylon bag technique with three canullated bovine and the times incubations were 6, 24 and 96 hours and sample of 45 days ensiling. The experimental period was of 36 days. The solution didn’t modify the content of DM, CP, ammonia N and pH of grasses silage. In case of NDF, Brachiaria silage treated with 20 mg level showed lower fiber content (67,99%) versus untreated control (70,28%), suggesting an improvement in the nutritive quality. There was no difference among period of storage neither interaction period of storage and enzymatic level. In situ rumen degradation, there was no difference among the treatments to the degradation of DM and NDF of grasses silage.,there was no difference among the treatments to the degradation of NDF of grasses silage.