Effect Of Xylanase Supplementation On Nutrient Digestibility And Availible Energy In Low Energy Diets For Growing And Finishing Pigs

In this study two feeding and digestibility trials were conducted to evaluate the effect of xylanase supplementation on bioavailible energy in wheat bran and double-low rapeseed meal of growing and finishing pigs.Experiment 1: A total of 72 Large yorkshirexLandrace crossbred pigs,average initial BW of 27.1 kg, were allocated to 9 dietary treatments and with 8 replicates each arranged as a 3 x 3 factorial design to study the interactions between xylanase and wheat bran in corn-based diets for growing-finishing pigs.Experimental diets consisted of 0 ,10% and 20% wheat bran. The xylanse inclusion levels is 0, 0.05 % and 0.10%. The experimental diets were aimed to be sufficient in crude protein and limiting in energy content with wheat bran as the adjustment for energy. The results suggested:1. Wheat bran proportions increased from 0 to 20% had no significant(P>0.05) effect on feed intake, growth rate and feed conversion ratio. Supplemental 0.05% xylanase in comparison to the control, ADFI increased 8.6%(P>0.05),9.6% (P<0.05)and 7.6%(P>0.05), respectively.2. As the increase of the wheat bran contents in growing-finishing pig diets, significantly decreased apparent fecal digestibility of DM(P<0.05),CP(P<0.01) and NDF(P<0.01). Supplemental xylanase in maize-based diets containing different level of wheat bran for growing-finishing pigs significantly(P<0.01) improved apparent fecal digestibility of CP and NDF and significantly(P<0.01) improved diets DE(P<0.05).The interaction of xylanase and wheat bran significantly(P<0.01) influenced apparent fecal digestibility of DM,CP and NDF. Supplemental 0.05% xylanase in diet with 10% wheat bran improved 100Kcal/kg DE,which is the best effect.Experiment 2: A total of 200 Large yorkshirexLandrace crossbred pigs,average initial BW of 30 kg, were allocated to 5 dietary treatments and each treatment with 3 replicate pens:2 large pens of 15 pigs per pen and 1 samll pen of 10 pigs, arranged as a 2 × 2 factorial design to study the effect of xylanase on dehulled DLRM and DLRM based diets for growing-finishing pigs. The result was as follows:1, Compared with the dehulled DLRM treatment with and without xylanase addition, positive control increased ADG 7.1% and 6.5% (P<0.05), respectively. Compared with the DLRM treatment, supplemental xylanase in dehulled DLRM treatment decreased ADFI and FCR by 9.6% and 7.2%(P<0.05).2, Compared with the dehulled DLRM treatment, supplemental xylanase increased ADG by 2.2%, decreased FCR by 5.2%; apparent fecal digestibility of CP and NDF increased by 11.79%(P<0.05)and 11.44%(P>0.05),respectively;DE increased by...