PALAVRAS CHAVE ADICIONAISDegradabilidade efetiva. Degradabilidade potencial.ADDITIONAL KEYWORDS Effective degradability. Potential degradabilbity. RESUMOObjetivou-se com este trabalho avaliar a degradabilidade in situ da matéria seca, proteína bruta e fibra em detergente neutro das silagens de variedades de cana-de-açúcar com aditivos. A avaliação da degradabilidade foi realizada segundo um delineamento em blocos casualizados, em esquema fatorial 2 x 6 sendo duas variedades de cana (IAC 86-2480 e RB 86-7515), e cinco aditivos (ureia, NaOH, CaO, milho grão moído e Lactobacillus buchneri), mais a silagem-controle, com 3 blocos (animais). A fração solúvel e a degradabilidade efetiva da matéria seca das silagens com NaOH e CaO aumentaram. A fração solúvel e a degradabilidade efetiva da proteína bruta foram maiores nas silagens com ureia. A degradabilidade efetiva da fibra em detergente neutro das duas variedades foi maior nas silagens com NaOH e CaO. As silagens com NaOH e CaO são de melhor valor nutricional, pois apresentam maior degradabilidade efetiva da matéria seca e fibra em detergente neutro. A variedade IAC 86-2480 apresenta melhor valor nutricional em relação à RB 86-7515, devido à maior degradabilidade efetiva da matéria seca. SUMMARYThe aim of this work was to evaluate the in situ degradability of the dry matter, crude protein and neutral detergent fiber of two sugarcane varieties ensiled with additives. The evaluation of the degradability was carried out according to a random blocks design, in factorial scheme 2 x 6, being two cane varieties (IAC 86-2480 and RB 86-7515), and five additives (urea, NaOH, CaO, corn and Lactobacillus buchneri), plus the control silage, with 3 blocks (animals). The NaOH and the CaO increased the values of soluble fraction and the effective degradability of dry matter. The soluble fraction and the effective degradability of the crude protein were higher with urea. The effective degradability of the neutral detergent fiber of the two varieties was higher in the silages with NaOH and CaO. The silages treated with NaOH and CaO are the best in nutritional value, because of the highest effective degradability of dry matter and neutral detergent fiber. The IAC 86-2480 variety presents better nutritional value than RB 86-7515, due to the highest effective degradability of dry matter.
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