Composição bromatológica de silagens de capim xaraés e piatã emurchecidas e acrescidas de aditivos

Abstract

The purpose of this study was to evaluate the chemical composition of piatã and xaraés grasses silages plus additives and wilted. The experiment was conducted on the University of Rio Verde, in Rio Verde state of Goias. The experimental design was completely randomized with four replications in a factorial 2 x 4, during the first period; two cultivars (Piatã and Xaraés) were used and time of wilting (0, 2, 4 and 6 hours). In the second stage, the silage wilted under 4hours of sun exposure was compared with the control (grass silages Piatã and Xaraés) and silage inoculated with bacterial enzymes and silage inoculant with the addition of 15% of pearl millet. For the process of grass silages, piatã and xaraés grasses were harvested at growth stage 40 days, to 20 cm from ground level. According to the results, wilting time of 4hours increased DM content from 23,6 % to 30,7 % in the grass xaraés and from 24,5 % to 34,00 % in the piatã grass; CP of 8,35 % to 9,54 % in xaraés grass and 9,08 % to 10,75 % in piatã grass; TDN of 57,98 % to 60,09 % in xaraés grass and 58,91 % to 61,45 % in piatã grass, the fibrous fraction (NDF) was reduced from 69,33 % to 66,05 % in xaraés grass and from 68,00 % to 64,32 % in piatã grass, ADF of 46,00 % to 43,65 % in xaraés grass and 44,32 % to 42,00 % in piatã grass. It promoted the lowering of pH rates from 5,00 to 4,32 and 4,33 to 4,25 in the silages of grasses xaraés and piatã, respectively. Inoculant and addition of 15% of millet bran were effective in increasing the CP content 8.72% to 12.46% and 10.07% to 12.95% to provide the rapid decrease in pH values 5.00 to 4.00 and 4.95 to 4.00, and decrease the components of the fibrous fraction of piatã and xaraés silages, in which the addition of 15 % of milet provided reduction of NDF 71 % to 66,25 % in xaraés grass and ADF 44,25 % to 36,25 % in xaraés grass and 44,75 % for 35,50 % in piatã grass.