Silagens de brachiaria brizantha sem aditivo, adicionada de cana de acúcar e aditivos bacterianos

Exportado OPUSMade available in DSpace on 2019-08-14T00:30:06Z (GMT). No. of bitstreams: 1 cristiano_g_jayme.pdf: 626192 bytes, checksum: ee6f7dd85884b9bd6fc78d9ae6149b26 (MD5) Previous issue date: 10Objetivou-se com este trabalho determinar o perfil de fermentação, avaliar a degradabilidade e a cinética de fermentação ruminal determinadas utilizando-se técnica in vitro semi-automática deprodução de gases e determinar o consumo e a digestibilidade aparente da matéria seca, da proteína bruta e da energia, balanço de nitrogênio e das frações fibrosas das silagens Brachiaria brizantha cvMarandu sem aditivos (T1), B. brizantha cv Marandu + inoculante bacteriano Sil-ALL C4 (T2), B. brizantha cv Marandu + inoculante bacteriano Bactosilo C Tropical (T3) e B. brizantha cv Marandu + 30% de cana de açúcar (T4) em ovinos. As silagens adicionadas de cana apresentaram os menores valores de pH dentre os tratamentos avaliados nas várias idades de abertura dos silos (p0,05). O maior potencial máximo de produção de gases foi de 188,98 mL/g de MS para o T1 e o menor de 180,09 mL/g de MS para a silagem do T2. O menor tempo decolonização foi para o T4 (2,92 h), sendo diferente dos demais (p0,05). Os maiores valores de digestibilidadeaparente da MS, PB e EB foram para o T2, sendo 60,88%, 44,27% e 57,54%, respectivamente e os menores valores para o T4 com 52,98%, 29,99% e 49,45%, respectivamente (p0,05). O menor consumo e digestibilidade aparente da FDN e FDA foram para o T4 (p0.05). The highest maximum gas productionpotentials was 188.98 mL/g of dry matter to T1 silage and the lowest to 188.98 mL/g of DM to T2. The lowest time of colonization was for T4 (2.92 h), being different of the others (p0,05). The largest apparent digestibility of dry matter, crude protein and crude energy was observed for T2, being 60.8%, 44.2% and 57.5%, respectively and the smallest for T4 with 52.9%, 29.9% and 49.5%, respectively (p<0,05). Alltreatments showed positive nitrogen balance and did not differ among them. The additives used did not promote improvements in the qualitative fermentation parameters and the parameters of kinetic degradation by semi-automated in vitro gas production technique of the evaluated silages.The use of incoculant or sugar cane, did not result in voluntary intake increase of dry matter, fibrous fractions and energy of silages

QUALITY AND NUTRITIONAL VALUE OF SILAGES OF THREE SORGHUM (Sorghum bicolor L.) HYBRIDS HARVESTED IN DIFFERENT MATURATION STAGES

Two dry stem intermediate height sorghum hybrids and a moist stem high height hybrid were ensiled in eight growing stages after bloom. Twenty four treatments were made with three repetitions each, being the three hybrids (AG2006 and BR700 – dry stem, and BR601 moist stem) ensiled in eight growing stages. Silages were evaluated for dry matter (DM), crude protein (CP), DM losses, silage density, pH, ammoniacal nitrogen (N-NH3), neutral detergent fiber (NDF), hemicellulose, cellulose and lignin, IVDMD and total phenols percentages. SNK test was used with a 3 x 8 random factorial design. DM production increased until fifth stage. DM values increased with growth and the best level occurred between 21st and 28th days after bloom. CP and fibrous fractions were reduced with growth. pH, N-NH3 and DM losses were low for all silages. Hybrids lignin and IVDMD varied in erratic ways. Silages were evaluated by Prussian blue assay to total phenols and tannins were detected in all of them. There were no negative correlations between tannins and IVDMD. AG2006 was better than the others two hybrids for some features, and IVDM of BR601, a forage sorghum, was better than BR700, an intermediate height sorghum