Elephant grass silage with the addition of crambe bran conjugated to different specific mass/Silagem de capim Elefante com adicao do farelo de crambe conjugado a diferentes massas especificas

This study aimed to evaluate the effects of inclusion of crambe bran concentrations (Crambe abyssinica Hochst.) with different specific masses in elephant grass silage (Penninsetumpurpureum Schum.). For that, the bromatological and microbiological compositions of the experimental silages were determined. We used 48 mini silos distributed in a completely randomized design, arranged in a factorial 4 X 3, four levels of inclusion of crambe bran (0; 10; 20 and 30%) and three specific masses (400; 500 and 600 kg MN [m.sup.-3]), with four replications. After 240 days of fermentation the silos were opened. It was observed linear effect on DM, CP, NDFap, ADFap, HEM, LIG, NFC, TC and population of bacteria that produce lactic acid with the addition of crambe meal. There was interaction between the crambe bran factors and specific masses on the values of pH and N-N[H.sub.3]. For MM variables and yeast count there was a negative linear effect due to the evaluated specific mass. The inclusion of crambe bran helps to increase the fermentative profile and the bromatological composition of elephant grass silages studied, and the best results were obtained with the addition of 30% of this co-product, based on the natural matter. Keywords: additive, co-product, Penninsetum purpureum, bromatological composition, fermentation. Objetivou-se avaliar os efeitos da inclusao de concentracoes do farelo de crambe (Crambe abyssinica Hochst.), com diferentes massas especificas, na ensilagem de capim-elefante (Penninsetum purpureum Schum.). Para tanto foram determinadas as composicoes bromatologica e microbiologica das silagens experimentais. Foram utilizados 48 minissilos distribuidos em delineamento inteiramente casualizado, arranjado em esquema fatorial 4 X 3, sendo quatro concentracoes de inclusao do farelo de crambe (0; 10; 20 e 30%) e tres massas especificas (400; 500 e 600 kg de MN [m.sup.-3]), com quatro repeticoes. Apos 240 dias de fermentacao os silos foram abertos. Foi observado efeito linear para os teores de MS, PB, FDNcp, FDAcp, HEM, LIG, CNF, CT e para a populacao de bacterias produtoras de acido latico com a inclusao do farelo de crambe. Houve interacao entre os fatores farelo de crambe e massas especificas sobre os valores de pH e N-N[H.sub.3]. Para as variaveis MM e contagem de leveduras houve efeito linear negativo em funcao da massa especifica avaliada. A inclusao do farelo de crambe contribui para incrementar o perfil fermentativo e a composicao bromatologica das