Degradabilidade e produção de gases in vitro de fontes energéticas alternativas na alimentação de ruminantes = Degradability and in vitro gas production of alternative energy sources in ruminant feed

Abstract

O padrão fermentativo in vitro de dietas compostas por fubá de milho, farelo de arroz integral, farelo de arroz parboilizado e suas associações em diferentes proporções foi estudado, na porção concentrada da dieta de ruminantes. Até 12h de incubação, a produçãode gases foi superior (p The in vitro fermentation pattern of diets composed of corn meal, rice bran, parboiled rice bran and their associations was studied in different proportions in the concentrate portion in ruminants diets. Up to 12 hours of incubation, gas production was higher (p < 0.05) for the treatments with rice bran (FAI) and parboiled rice bran (FAP); however, after 96 hours, the treatment with 100% corn meal (FM)produced more (p < 0.05) gases (379.41 mL g DM-1). Total degradability of dry matter (DM) and organic matter (OM) were higher (p < 0.05) for treatments FAI and FAP up to 12 hours; however, after 96 hours of incubation the total degradability of DM and OM was higher (p < 0.05) for the FM treatment (90.46 and 91.08%, respectively). The nutritional potential of rice bran or parboiled rice bran was confirmed in the diet of ruminants, as it provides a higher fractional rate of in vitro gas production (12.39 and 13.17 mL h-1) and faster degradation of DM and OM in initial times.

Keywords

• arroz parboilizado
• parâmetros de France
• taxa de passagem
• tempo de colonização
• parboiled rice
• France’s parameters
• rate of passage
• colonization time