Silagens de forrageiras adaptadas ao semiárido na alimentação de novilhas leiteiras

Abstract

The objective of this research was to evaluate different roughages in the diet of Holstein x Zebu crossbred heifers confined in a semi-arid region. This is a meta-analysis whose database was created based on the results of research carried out by the Postgraduate Program in Animal Husbandry at Unimontes in Janaúba/MG, being used as silages: sorghum Volumax (Sorghum bicolor (L.) Moench ); sorghum biomass BRS 716 (Sorghum bicolor (L.)); BRS-capiaçu grass (Pennisetum purpureum Schum); millet (Pennisetum glaucum (L.) R. Br.); BRS-capiaçu grass (Pennisetum purpureum Schum) associated with cactus (Opuntia spp.) and sorghum biomass BRS 716 (Sorghum bicolor (L.) associated with cactus (Opuntia spp). There were differences in the consumption and digestibility of nutrients in new according to the different forages (P<0,05). In relation to ingestive behavior, the feed efficiency in MS was higher for diets with silages ofsorghum varietiesIngested in diets based on millet and sorghum Volumax. Regarding productive performance, there were no significant differences between the initial and final weights of the new products. However, the average daily weight gain (ADG) was reduced by 52.63% for the diet with BRS-capiaçu grass. It is clear that lower intake, quality and digestibility in BRS-capiaçu silage and mixed BRS-capiaçu (or BRS 716) + palm diets limit the performance of new dairy crossbreeds compared to Volumax sorghum, sorghum biomass BRS 716 silages. and Millet.