ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2017, Vol. 48 ›› Issue (8): 1468-1480.doi: 10.11843/j.issn.0366-6964.2017.08.011

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Optimization of Non-starch Polysaccharide Enzymes of Corn-Soybean-DDGS and Wheat-Soybean Diets for Growing Pig Using in vitro Method

ZHANG Li-lan1, GAO Li-xiang1,2, CHEN Liang1, ZHONG Ru-qing1, ZHANG Hong-fu1*   

  1. 1. State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    2. Guangdong Wens Foodstuff Group CD., LTD., Yunfu 527439, China
  • Received:2017-04-10 Online:2017-08-23 Published:2017-08-23

Abstract:

The study was conducted to optimize non-starch polysaccharide(NSP) enzymes of corn-soybean-DDGS diet and wheat-soybean diet for growing pigs using in vitro method. The NSP enzymes (cellulase, xylanase, β-mannanase, α-galactosidase, β-glucanase and pectinase) were added into the corn-soybean-DDGS diet and the wheat-soybean diet. In a one-way completely randomized experimental design, in vitro dry matter digestibility (IVDMD) of the two diets was determined using the gastric fluid and small intestinal fluid based on physiological data of growing pigs and the dose-response of the NSP enzymes on the IVDMD of diets were analyzed,respectively. Then the regression relationship of 6 NSP enzymes and the IVDMD of diets were established and the optimal NSP enzyme components was screened using a quadratic regress-universal rotary design. The results showed that:1) Quadratic effects of NSP enzymes on the IVDMD of corn-soybean-DDGS and wheat-soybean diets for growing pig were observed in the present study. 2) The optimal NSP enzyme components were 427.1 U·kg-1 cellulase, 7 057.5 U·kg-1 xylanase, 3 587.8 U·kg-1 β-mannanase, 202.1 U·kg-1 α-galactosidase, 1 543.3 U·kg-1 β-glucanase and 72.7 U·kg-1 pectinase for corn-soybean-DDGS diet, and 1 117.9 U·kg-1 cellulase, 35 087.7 U·kg-1 xylanase, 1 917.1 U·kg-1 β-mannanase, 305.0 U·kg-1 α-galactosidase, 806.7 U·kg-1 β-glucanase and 133.7 U·kg-1 pectinase for wheat-soybean diet. 3) The IVDMD of corn-soybean-DDGS diet and wheat-soybean diet with the optimal NSP enzymes were increased by 3.89% and 3.48%, respectively. The optimal NSP enzyme components effectively improve the IVDMD of corn-soybean-DDGS diet and wheat-soybean diet. The in vitro digestion method based on physiological parameter of growing pigs can be used as a convenient and rapid method for screening NSP enzyme components of a swine diet.

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