The effect of arabinoxylanase and protease supplementation on nutritional value of diets containing wheat bran or rice bran in growing pig
Y.-L. Yin 1, 2  
,   Z.-Y. Deng 1, 2,   H.-L. Huang 2,   T. J. Li 2,   H.-Y. Zhong 2
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Department of Food Science and Engineering, Nanchang Universit, Nanchang 330047, P.R. China
Key Laboratory of Subtropical Agro-ecology, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha, P.O. Box 10, Hunan 410125, P.R. China
Y.-L. Yin   

Institute of Subtropical Agriculture, the Chinese Academy of Sciences, Changsha, Hunan 410125, P.O.Box 10, P.R. China
Publication date: 2004-06-16
J. Anim. Feed Sci. 2004;13(3):445–461
One digestibility and one performance experiments were conducted to investigate the effects of a feed enzyme of arabinoxylanase and arabinoxylanase plus protease on digestibility of nutrients, nitrogen (N) flow and performance of the growing pigs fed a maize-wheat bran-based diet or a maize-rice bran-based diet. In the digestion experiment, six Landrace × Large White × Chinese Black male pigs of approximately 20 kg initial body weight , fitted with a simple T-cannula at the terminal ileum, were used to study dietary nutrient digestibility and nitrogen flow of the experimental diets. The six experimental diets were prepared in this study: maize-wheat bran diet, consists of maize, wheat bran, soyabean, of rapeseed meal, without feed enzyme supplementation (MWB); MWB supplemented with arabinoxylanase (A); MWB supplemented with arabinoxylanase plus protease (AP); maize-rice bran diet, consists of maize, rice bran, soyabean, rapeseed meal, without feed enzyme supplementation (MRB); MRB supplemented with arabinoxylanase (A); MRB supplemented with arabinoxylanase plus protease (AP). The MWB diet contained: %: soluble nonstrach polysaccharide (NSP) 0.8, insoluble NSP 19, crude protein 22, and 18.6 MJ/kg gross energy (GE), while the MRB diet contained, %, respectively: 0.5, 22, 21, and 18.9 MJ/kg GE. In the performance experiment, lasting 40 days, 60 pigs (30 gilts and 30 castrates) with body weight of 20.5±0.76 kg were randomly allocated to the six dietary treatments with a completely randomized design (5 gilts and 5 castrates per treatment). Feed and water were provided ad libitum. The results show there were no significant differences in average daily gain (ADG) (P=0.09), feed gain ratio (F/G; P=0.09), ileal digestibility of nutrients (P=0.09) and N flow (P>0.08) between the MWB and MRB diet, although the crude fibre level in the MRB diet had higher crude fibre content (9.7 g/kg) than that the MWB diet. The dry matter intake (DMI) of the MWB diet was increased (P<0.05) by the enzyme A supplementation. The ADG and F/G of the pigs fed the MWB diet were improved (P<0.05) by either arabinoxylanase or arabinoxylanase plus protease supplementation. The ileal endogenous N excretion determined with enzymatic hydrolysed casein diet in this experiment was half higher than that calculated from the N-free diet. The ileal digestibility of soluble NSP fractions of the MWB and MRB diets were significantly (P<0.05) increased by either enzyme arabinoxylanase or arabinoxylanase plus protease supplementation. There was no enzyme effect on insoluble NSP fraction digestibility. The results of this study suggest that NSP degrading enzyme do mainly reduce the negative nutritional effect of the soluble NSP in the small intestine of growing pigs.
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