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A.Z.M. Salem

A.Z.M. Salem

Autonomous University of the State of Mexico

Title: Dietary xylanase addition and nutrient digestibility, rumen fermentation and duodenal fibre digestion in sheep


Biography: A.Z.M. Salem


The current study aimed to determine the effect of adding xylanase enzyme (XY) in a basal diet contain 30% corn stover on feed intake, ruminal fermentation, digestibility, duodenal fibre digestibility and some blood urea, phosphorus and triglycerides. Four males Rambouillet sheep (39±1.8 kg BW), with permanent rumen and duodenum cannulas were used in a 4×4 Latin square design. Sheep were distributed and fed on a basal diet without enzyme addition (XY0), or with addition of xylanase at 1 (XY1), 3 (XY3), and 6 (XY6) µL /g DM of the basal diet for 21 days. The duodenal neutral detergent fibre (NDF) and acid detergent fibre (ADF) digestibilities were determined at the days16 and 17. The treatments XY1 and XY3 increased (P <0.05) feed intake from different nutrients with no difference between XY0 versus XY1 and XY3 for crude protein, NDF and ADF intakes. Increased total tract digestibilities were obtained with XY6 with lower digestibility for XY0 and XY3 (P <0.05). Duodenal NDF and ADF digestibility were increased with increasing doses of XY (P <0.05). No effect was observed on measured blood parameters due to addition of XY. Both of XY1 and XY3 increased values (P <0.05) of ruminal pH at all sampling times (P <0.05). Increased (P <0.05) ruminalammonia-N and acetic acid concentrations were in XY6 and XY3 sheep. The lowest (P <0.05) daily methane production was in XY6 sheep. However, XY6 increased ruminal microbial protein production compared to other treatments. It could be concluded that addition of XY at 3 and 6 µL /g DM of the basal diet of Rambouillet sheep improved nutrients digestibility and ruminal fermentation without affecting blood parameters, and with low feed consumption.

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