Valor Nutricional de Silagens de 8 Híbridos de Sorgo ( Sorghum bicolor L. Moench) Cultivados no Ecótono Cerrado Amazônia.

Abstract

This experiment was conducted to identify the best sorghum hybrids grown in the state of Tocantins for silage production. Thus the nutritional value of eight sorghum hybrids F69T02, F69T03, F69T07, F69T11, F69T17, F69T21, F69T22, F69T25 were evaluated. Using the in vitro technique of gas production. The experimental design was randomized blocks with 8 treatments and three blocks (inocula of different cows) the model of France et al. (1993) was used to describe the maximum potential of gas production (A), colonization time (L), gas production rate (μ) and effective dry matter degradability (DEMS) for the passage rates of 2 , 5 and 8% h-1. The maximum potentials for gas production ranged from 211.54 to 246.84 mL g -1 of MS. Colonization times were low, gas production rates were between 0.023 and 0.0255 mL g -1 of MS h-1. For the DEMS, the hybrids maintained similar behavior to DMS in 96 hours of incubation, with greater degradability for hybrids F69T22, F69T03, F69T17. The F69T22 hybrid presented the highest gas production curve, followed by the F69T17. The smallest curve was presented by the hybrid F69T02. The parameters of France et al. (1993) associated to the bromatological composition of the silages indicate the hybrid F69T22, because it is a highlight of the others because it presents a higher cumulative gas production and a shorter time of colonization.