Quality of sorghum hybrid silages at different storage times

Abstract

The objective of this study was to evaluate the nutritional changes in silages of four sorghum hybrids at different storage times. The  design was a completely randomized in a 4 × 9 arrangement of plots with four replications. The four sorghum hybrids, Qualysilo,  Chopper, Dominator, and Maxisilo, were allocated to the plots. In the subplots, sampling times were considered in fresh material and  after 1, 3, 7, 14, 28, 56, 112, and 224 days of storage. The material was ensiled in experimental polyvinyl chloride silos and subsequently  evaluated for chemical composition and fermentative profile over the nine different periods of the fermentation process. Crude protein  was reduced by 1.21g/kg per day until the third day of fermentation. The levels of neutral detergent insoluble nitrogen and acid  detergent insoluble nitrogen exceeded the upper limit of 311 g/kg of N. Of the studied silages, an NDF content of 734 g/kg was obtained  in Maxisilo, which was higher than the other silages (average: 547 g/kg). Silage production can be achieved with the four materials;  however, the Maxisilo sorghum provides silages of lower quality, with a DM content of less than 30%. The other materials fit into the  nutritional profiles proposed by the literature, characterizing them as good quality silages.