Alterações bromatológicas e degradabilidade ruminal “in situ” da silagem de girassol associada com aditivos redutores de umidade

Abstract

Objective of this work was to evaluate the chemical composition and bromatologic the nutritional value of sunflower silages with the inclusion of animal byproducts and the rumen degradability. The variables analyzed were pH, dry matter content, and nutritional value of the silage of sunflower in different times of opening. The variety used was sunflower EMBRAPA 122-V2000, harvested at 90 days of growth, chopped and enriched with 5% wheat bran and 5% citrus pulp soon to be ensiled in experimental silos 45, the original material without additive also was ensiled. The silos were opened with 0, 21, 42, 63 and 84 days of ensiling. The experimental design was a completely randomized design and treatments arranged in a 3x5 factorial design (three treatments, open five days) with three replications. For degradation "in situ" were used three of the Jersey breed cattle fistulated, fitted with ruminal cannulas in a randomized block design, each animal being considered as a block. The silages were ground, weighed and placed in bags of TNT for the soon to be introduced directly into the rumen, in decreasing order of 96, 48, 24, 12, 6, 3:00 pm With the inclusion of additives had lower values of NDF and ADF in relation to fresh silage. 9.27% was the highest amount of CP with the addition of FT. in 42 days we obtained values of 46.78% and 29.78% NDF ADF, CP was 9.49% for this day and IVDMD with 70.91% for the same day. The soluble fraction of FT SG + DM and NDF was 17.30% and 40.51% respectively. The greatest potential degradability were 76.31% for DM and NDF 89.55% with the addition of PC. The highest degradation rates were obtained in 42 days of opening, with 2.224% to 0.229% for MS and the NDF with high values of potential degradability in the same opening day.