Degrada o ruminal da fra o fibra de silagens de milho sem espigas com cana-de-a úcar e baga o de mandioca = Fiber fraction ruminal degradation of corn silage without spikes with sugar cane and manioc pulp

Avaliou-se a degrada o ruminal da fibra em detergente neutro (FDN) e em detergente ácido (FDA) de silagens de milho sem espigas (SMSE) com cana -de-a úcar (CA) e baga o seco de mandioca (BSM), comparadas com a silagem de milho com espigas (SMCE). Os alimentos foram ensilados com (CI) e sem inoculante (SI) - Lactobacillus plantarum e L. paracasei ssp. paracasei. Estudaram-se: as fra es solúvel (A), potencialmente degradável (B) e n o-degradável (C); a taxa de degrada o da fra o B (c); a degradabilidade efetiva (DE) e potencial (DP). Os tratamentos foram: T1 (SMSE + 20% CA-SI); T2 (SMSE + 20% CA-CI); T3 (SMSE + 35% CA-SI); T4 (SMSE + 35% CA-CI); T5 (SMSE+ 20% BSM-SI); T6 (SMSE + 20% BSM-CI); T7 (SMSE + 35% BSM-SI); T8 (SMSE + 35% BSM-CI); T9 (SMCE-SI) e T10 (SMCE-CI). Médias foram comparadas em um delineamento inteiramente casualisado. As mai ores (p<0,05) fra es B da FDN foram verificadas nos tratamentos T7 (B = 74,8%), T8 (B = 70,2%), T6 (B = 66,2%) e com a menor adi o de CA, ou seja: em T2 (B = 65,0%). N o houve diferen a (p >0,05) para a fra o C da FDA dos tratamentos T3 (C = 20,7%), T4 (C = 22,6%), T9 (C = 22,7%) e T10 (C = 24,0%). Os resultados indicam que há possibilidade para a inclus o do BSM no lugar das espigas de milho verde para a produ o de silagem até o nível de 35%. This study aimed to evaluate the ruminal degradation of corn silages without spikes (CSWS), with addit ion of sugar cane (SC) and dry manioc pulp (DMW), compared to corn silage (CS). The feeds were ensiled with (WI) and without (IF) inoculants - Lactobacillus plantarum and L. paracasei ssp. paracasei. The following fractionswere studied: water soluble (A), potentially degradable (B), non degradable (C), fraction B degradable ratio (c); effective (ED) and potential (PD) degradability. The treatments evaluated were: T1 (CSWS + 20% SC -IF); T2 (CSWS + 20% SC-WI); T3 (CSWS + 35% SC-IF); T4 (CSWS + 35% SC -WI); T5 (CSWS + 20% DMW-IF); T6 (CSWS + 20% DMW-WI); T7 (CSWS + 35% DMW -IF); T8 (CSWS + 35% DMW-WI); T9 (CS-WI) and T10 (CS-IF). The average differences were compared on a completely randomized model. Higher (p<0.05) B fractions for FDN were observed for T7 (B= 7 4.8%), T8 (B= 70.2%), T6 (B= 66.2%) and where the low sugar cane level was added on silages, that is, T2 (B= 65.0%). No differences (p >0.05) were observed between ADF C fraction for T3 (C=20.7%), T4 (C= 22.6%), T9 (C= 22.7%) and T10 (C= 24.0%). Results in dicate the possibility to include DMW on corn silage, instead of green spikes, to the level of 35%.