Supplementation of Rice Straw (Oryza sativa) Based Diet With Exogenous Xylanase: İntake, Diet Digestibility and Growth Rate of Goats

Abstract

The present study was conducted to examine the effect of supplementing rice straw based diet with exogenous enzyme xylanase on diet digestibility, growth performance and enteric methane production of goats. Two blocked groups of exogenous xylananse (EXY) and a control were used. The experiment was carried out for 60 days, i.e., a 10-day adaptation period, 40-day experimental feeding, 7-day total feces collection and 3-day methane measurements. Average daily gain (ADG; g / day / animal) in EXY group was significantly higher than the control group, where no difference was observed when ADG is expressed in terms of metabolic body weight. Intake of dry matter (DM; g / day / animal), organic matter (OM) and crude protein content (CP) were not significantly affected by EXY, but intake of neutral detergent fiber (NDF) improved significantly. Apparent DM, OM and NDF digestibility enhanced significantly while there was no difference observed in CP digestibility. Amount of CH4 (ml /100 ml rumen gas) was not significantly different between EXY and control group though the value was numerically lower in EXY group. In conclusion, the supplementation of rice straw based diet with EXY for goats is beneficial in means of ADG, intake of NDF and digestibility of DM, OM and NDF.