This experiment aimed to evaluate the ruminal degradability in situ of the dry matter (DM), crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF) of Guinea grass silages. The experimental design was completely randomized with six treatments and six repetitions: Guinea grass silage, Guinea grass silage inoculated with 10% wheat bran, Guinea grass silage inoculated with 10 6 cfu/g of strains of Streptococcus bovis JB1; Guinea grass silage inoculated with 10 6 cfu/g of

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... rains of Streptococcus bovis JB1 plus 10% of wheat bran; Guinea grass silage inoculated with 10 6 cfu/g of strains of Streptococcus bovis HC5; Guinea grass silage inoculated with 10 6 cfu/g of strains of Streptococcus bovis HC5 plus 10% of wheat bran. The silages inoculated with Streptococcus bovis and with added wheat bran resulted in higher values of ruminal degradability of DM, 32.76% and 32.17%, and of crude protein 38.28% and 37.89%. For the effective and potential degradability of DM, CP, NDF and ADF the highest values occurred for silages in these silages as well, in all passage rates. There is a similarity between the responses of Streptococcus bovis JB1 and the HC5, and the wheat bran enhanced the effectiveness of the microbial additive.