Losses, fermentative profile and chemical composition of “Brachiaria decumbens” silage with inclusion of rice meal

Abstract

The objective was to assess the effects of rice meal over losses by gas and effluent, the fermentative profile and the chemical composition of Brachiaria decumbens cv. Basilisk silage in laboratory bags. Entirely random lining was used, with five treatments: 0; 10; 20; 30 and 40g/kg rice meal, based on natural grass matter. The values of losses by gas and effluents were reduced linearly in 0.11 and 0.39g/kg DM, while recovery of dry matter increased linearly in 0.32g/kg DM. There was quadratic behavior for pH values and linear decrease for the values of N-ammoniacal and buffering power estimated in 1.1 and 5g/kg DM. Concentrations of acetic, butyric and propionic acids were reduced linearly in 0.1; 0.008 and 0.006g/kg DM, while lactic acid increased linearly in 0.5g/kg DM. Each 1g/kg rice meal promoted linear increase of 4.3; 1.8; 7.1 and 7.0g/kg dry matter levels, crude protein, ethereal extract and total digestible nutrients and linear decrease of 6.9; 4.3 and 2.6g/kg DM of fiber in neutral detergent, fiber in acidic detergent and hemicellulose levels. Inclusion of 10g/kg rice meal already ensures lowering losses by gas and effluents, increase in dry matter recovery, allowing improvements on the fermentative profile and the chemical composition of silage.