Forage peanutand soybeanbased legume silages: fermentation profile and performance of crossbred beef cattle

Foram conduzidos quatro experimentos objetivando-se avaliar a composição química, o perfil fermentativo e a recuperação de matéria seca em silagens mistas de capim- marandu e de amendoim forrageiro tratadas com inoculante bacteriano (Capítulo 1); a composição química e o perfil fermentativo de silagens de amendoim forrageiro tratadas com inoculante bacteriano e melaço em pó (Capítulo 2); o consumo, a digestibilidade aparente total dos nutrientes e os parâmetros ruminais em bovinos canulados no rúmen com dietas contendo silagens de soja, milho ou sorgo, bem como o desempenho produtivo de bovinos de corte (Capítulo 3). No capítulo 1, observou-se efeito da interação nível de amendoim forrageiro (AF) ×inoculante (I) (P0,05) para os ácidos orgânicos.No capítulo 3, observaram-se menores valores (P0.05) of the M × I interaction was observed for DM, OM, CP, TC, NDF, NDFap, NFC and TDN intakes by the animals supplemented with diets containing soybean silage exclusively as a forage source. The greatest mean values (P<0.05) of apparent digestibility of DM, OM, CP, TC and NFC were observed for the diet with100% corn silage (79.40%, 80.64%, 67.18%, 63.60% and 73.25%) andthe dietwith 50% soybean silage:50% corn silage (78.20%, 79.18%, 80.64%, 79.17% and 88.86%). The collection times had an effect (P<0.05) on the ruminal pH values of the diets, whose data fitted the following quadratic model: &#374;= 6.0452 + 0.2648 T 0.09955 T 2 , with R 2 = 83.42%.The lowest intakes of DM, OM, CP, NDF, NDFap, TC, NFC and TDN (P<0.05) were found in the animals fed diets containing soybean silage exclusively as a forage source. The highest mean values of apparent digestibility of DM, OM, CPand EE were observed (P<0.05) for diets containing soybean silage solely, sorghum silage only and 50%soybean silage:50% corn silage, which did not differ statistically from each other. Regarding productive performance, the greatest (P