Silagens de sorgo biomassa BRS 716 e capim BRS capiaçu associadas com palma forrageira no semiárido mineiro

Abstract

Forage conservation emerges as a feeding strategy in ruminant production systems when there is a feeding deficit. The silage technique allows the use of different forages, as long as the dry matter content, water-soluble carbohydrates, buffering power and fermentative capacity are adequate. The objective was to evaluate mixed silages of forage sorghum and BRS 716 biomass and BRS capiaçu grass silage associated or not with forage cactus on the fermentative profile and nutritional value. Forage sorghum cv. Volumemax; sorghum biomass cv. BRS 716; BRS capiaçu grass; 60% BRS 716 biomass sorghum + 40 % forage cactus Opuntia ficus indica Mill (giant), on the basis of natural matter; and 60 % BRS capiaçu grass + 40 % forage cactus Opuntia ficus indica Mill (giant), on the basis of natural material. The experiment was carried out following a completely randomized design, with five treatments and eight replications. The silages of forage sorghum cv. Volumax and biomass sorghum cv. BRS 716 showed higher (P < 0.01) temperature. The highest gas losses (P < 0.01) and lowest recoveries of DM (P<0.01) were observed in silages of BRS capiaçu and BRS capiaçu grass with forage cactus. The silages of Volumax sorghum and BRS 716 biomass presented higher dry matter contents (P<0.01) ; mean of 33.44 %) in relation to the other silages. Silage of Volumax sorghum and BRS 716 biomass sorghum with forage cactus showed higher values of water-soluble fraction (fraction a) of 23.59 % of DM (P<0.01) in relation to the other treatments (average of 19.14 % ). The mixed silage of sorghum biomass with forage cactus showed lower fermentation losses and higher dry matter recovery.