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- or wheat and barley-based diets were supplemented or not with xylanase \-glucanase (Quatrazyme HP, Nutri-Tomen, France) and fed to broiler chickens (n = 12 per group) from 3 to 25 days of age. The unsupplemented wheat and -based diet reduced (P \ 0. 05) weight gain and feed intake, and increased feed conversion ratio as compared to the corn-based diet. Viscosity in the of the small intestine contents was increased (P \ 0. 05), whereas and osmolality values decreased (P \ 0. 05). Crude fat and protein were reduced as well as the apparent metabolizable energy (P \ 0. 05). Moreover, wheat and barley consumption, when compared with corn-based diet, produced an increase in the microflora of the caeca, 10. 0 vs. 8. 9 log CFU\g^-1 for facultative anaerobic bacteria, 6. 5 vs. 5. 6 log CFU\g^-1 for E. coli and 9. 7 vs. 8. 3 log CFU\g^-1 Lactobacillus. The addition of xylanase and \-glucanase to the wheat barley-based diet significantly reduced the viscosity of the small intestine contents and (P \ 0. 05) weight gain, feed intake and feed conversion ratio. digestibility of the nutrients, the apparent metabolizable energy and osmolality of the small intestine contents were also increased without in pH values. At the same time, the number of total facultative bacteria and E. coli decreased significantly (P \ 0. 05). conclusion, the addition of xylanase and \-glucanase improves the of a wheat and barley-based diet, probably by reducing viscosity of the intestine content and by impeding the growth of (total facultative anaerobic bacteria, E. coli).
Mathlouthi et al. (Sun,) studied this question.