Cinética de degradación ruminal y producción de gas in vitro del rastrojo de Amaranthus cruentus en bovinos

Abstract

The aim of this research was to evaluate the ruminal degradation kinetics of dry matter, apparent digestibility of dry matter, in vitro rumen protozoa and in vitro gas production in cattle. A bull provided with a cannula in the rumen (ruminal degradation and rumen fluid donation) was used. It was evaluated; ruminal degradation of dry matter, in vitro digestibility of dry matter, in vitro gas production and population in vitro rumen protozoa. Treatments: T1: 100% amaranth stubble, T2: kikuyo 100%, T3: stubble amaranth 25% + Kikuyo 75%, T4: amaranth stubble 50% + Kikuyo 50%. Digestibility and in vitro gas production was higher and lower respectively, only treatments with amaranth (T1), only kikuyu (T2) and in proportions of 50:50 of kikuyo and amaranth (T4). The population of rumen protozoa in vitro from hour 0 to 12 showed no differences (P> 0.05) between treatments in both stocks Entodiniomorfos and Holotrichs. From of hour 24 to 48 the holotrichs protozoa showed the differences between treatments (P <0.05). The soluble fraction (A) shows differences (P <0.05) between treatments. The insoluble but potentially degradable fraction shows differences (P <0.05) between treatments and T1 showed higher (0.054% / h: P <0.05) percentage degradation rate per hour (c) that other treatments. It is concluded that the use of diets with unconventional foods such as Amaranthus cruentus helps reduce the amount of protozoa and thus the production of greenhouse gases.