Objective

To evaluate the in vitro digestibility of the Musa paradisiaca L., pretreated with exogenous xylanase enzyme for feeding ruminants.

Materials and Methods

A complete randomized design was applied, with for treatments and three repetitions, using exogenous fibrolytic enzymes (xylanase). The treatments were: T0-Banana peel without enzymes (Control), T1-Banana peel + 2 000 IU of enzyme/kg DM, T2-Banana peel + 4 000 IU of enzyme/kg DM and T3-Banana peel + 8 000 IU of enzyme/kg DM. For conducting the experiment, 24 bottles were prepared and six bottles per treatment were used. The chemical composition of the feedstuff was characterized. In addition, the in vitro dry matter apparent digestibility was determined, which was measured at 24 and 48 h of incubation. Simultaneously, the gas production was recorded at different times: 3, 6, 12, 24 and 48 h.

Results

The in vitro ruminal digestibility, at 24 and 48 h, with the utilization of xylanase, showed highly significant differences among treatments (p < 0,05). The highest in vitro digestibility percentage at 24 h was in T2 (42,8 %), which increased until 48 h (58,2 %). In the in vitro gas production, during the first three hours, no significant differences were recorded among treatments; while at 6, 12, 24 and 48 h, there were differences among them (p < 0,01). The maximum gas production was reached at 48 h, in treatment T2, with mean value of 284,29 mL/g DM. The lowest one corresponded to T3 (229,7 mL/g DM).

Conclusions

The in vitro digestibility of the M. paradisiaca peel increased with the utilization of the fibrolytic enzyme. In turn, the best results were obtained when 4 000 IU of enzyme/kg DM were used.

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