This experiment was conducted to investigate the effects of wheat-based diets supplemented with xylanase on growth performance, nutrient apparent digestibility ,serum biochemical parameters and intestinal microbial flora of growing pigs, and to explore the optimal level of xylanase. A total of eighty healthy crossbred pigs (Duroc譒andrace譒arge) with an average bodyweight of 40 kg were randomly allotted into 5 treatments with 4 replicates per treatment and 4 pigs per replicate. Pigs in positive control group were fed the corn-soybean basal diet, pigs in negative control group were fed the wheat-soybean basal diet, and the others in xylanase groups were fed the wheat-soybean basal diet supplemented with 500, 1 000 and 2 000 U/kg xylanase, respectively. The experiment lasted for 28 days. The results showed as follows:1) the wheat-soybean basal diet supplemented with xylanase significantly increased the average daily gain (P<0.01), average daily feed intake (P<0.05) and nutrient apparent digestibility (P<0.05) of growing pigs, and the best results were obtained at 2 000 U/kg xylanase group, the average daily gain and average daily feed intake were increased by 26.0% and 16.5% (P<0.01). 2) The wheat-soybean basal diet supplemented with xylanase significantly increased the contents of glucose, triiodothyronine, thyroxine, and D-xylose in serum of growing pigs (P<0.05, P<0.01), while significantly decreased the serum urea nitrogen content (P<0.01). 3) The intestinal microbial flora was affected by dietary composition and xylanase, diets supplemented with xylanase could maintain the microflora balance for pigs, and the composition of intestinal flora by adding 2 000 U/kg xylanase was similar to the corn-soybean basal diet. In conclusion, adding 2 000 U/kg xylanase can significantly improve the growth performance and nutrient apparent digestibility of pigs that fed with wheat-soybean basal diet, and maintain the balance of intestinal flora. The optimal level of xylanase for growing pigs in the wheat-soybean basal diet (containing 11.2% xylan) is 2 000 U/kg.
WANG Li
,
HE Jun
,
YU Bing
,
HUANG Zhiqing
,
MAO Xiangbing
,
ZHENG Ping
,
CHEN Daiwen
. Effects of Wheat-Based Diets Supplemented with Xylanase on Growth Performance, Serum Biochemical Parameters and Intestinal Microbial Flora of Growing Pigs[J]. Chinese Journal of Animal Nutrition, 2012
, 24(10)
: 1920
-1927
.
DOI: 10.3969/j.issn.1006-267x.2012.10.011
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