Application Effects of Different Non-Starch Polysaccharide Complex Enzymes on Wheat-Based Diets for Broilers

WANG Dongqun; DING Xuemei; BAI Shiping; LUO Yuheng; WANG Jianping; ZENG Qiufeng; ZHANG Keying

doi:10.3969/j.issn.1006-267x.2013.10.021

Chinese Journal of Animal Nutrition >

2013 , Vol. 25 >Issue 10: 2371 - 2385

DOI: https://doi.org/10.3969/j.issn.1006-267x.2013.10.021

Feed Science and Technology

Application Effects of Different Non-Starch Polysaccharide Complex Enzymes on Wheat-Based Diets for Broilers

WANG Dongqun ,
DING Xuemei ,
BAI Shiping ,
LUO Yuheng ,
WANG Jianping ,
ZENG Qiufeng ,
ZHANG Keying

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Institute of Animal Nutrition, Key Laboratory for Animal Disease-Resistance Nutrition of China Ministry of Education, Sichuan Agricultural University, Ya'an 625014, China

Received date: 2013-04-07

Online published: 2013-09-16

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Abstract

This experiment was conducted to investigate the effects of dietary different non-starch polysaccharide (NSP) complex enzymes on growth performance, digestive tract physiology, carcass performance, the number of intestinal microorganism and economic efficiency of broilers fed wheat-based diets. A total of 900 Cobb male broilers aged 1 day were randomly assigned to 5 groups. A positive control group (PC group) was fed a basal diet with normal energy level, and a negative control group (NC group) was fed a diet with a lower energy level (350 kJ/kg metabolizable energy reduction from PC group diet). Other three complex enzyme groups were fed the NC group diets added with NSP complex enzyme 1 (300 g/t), NSP complex enzyme 2 (300 g/t) and NSP complex enzyme 3 (500 g/t), respectively. This experiment included 2 periods, early period (1 to 21 d) and later period (22 to 42 d). The results showed as follows: 1) there were no significant differences in the average body weight, average body weight gain, average feed intake and feed/gain among all groups in every period of the experiment (P>0.05). Compared with PC group, the average body weight and average body weight gain in NC group were slightly decreased (P>0.05),and the feed/gain was increased (P>0.05), but adding NSP complex enzymes could improve those indices. 2) There was no significant difference in the relative weight of muscular stomach, glandular stomach, duodenum, jejunum, ileum and cecum on 21 d and 42 d among all groups (P>0.05). Compared with NC group, the relative weight of jejunum and ileum on 21 d and 42 d in NSP complex enzyme 1 group and NSP complex enzyme 2 group was decreased (P>0.05), and the relative weight of cecum was increased (P>0.05). There was no significant difference in the relative length of duodenum, jejunum, ileum and cecum on 21 d and 42 d among all groups (P>0.05). Compared with PC group, the relative length of intestine (expect for duodenum on 21 d) in NC group were increased (P>0.05). Compared with NC group, the relative length of jejunum and ileum on 21 d and 42 d in NSP complex enzyme 1 group and NSP complex enzyme 2 group was decreased (P>0.05). 3) On 21 d, compared with PC group, the crypt depth of duodenum in NSP complex enzyme groups was significantly increased (P<0.05), and the crypt depth of jejunum in NC group was significantly increased (P<0.05). There was no significant difference in the intestine muscular thickness among all groups (P>0.05). On 42 d, compared with PC group, the villus height of duodenum in other groups was decreased (P>0.05). Adding NSP complex enzymes significantly decreased the villus height of jejunum compared with NC group (P<0.05). 4) There was no significant difference in carcass performance among all groups (P>0.05). Compared with PC group, the percentage of abdominal fat in NC group was decreased (P>0.05). The dressing percentage and the percentages of half-eviscerated yield, eviscerated yield and breast muscle in NSP complex enzyme 3 group were slightly improved compared with NC group (P>0.05). 5) There was no significant difference in the number of Escherichia coli, Bifidobacteria and Lactobacillus on 7, 21 and 42 d among all groups (P>0.05). Compared with PC group, the number of Escherichia coli and Lactobacillus on 7 and 42 d and the number of Bifidobacteria on 7, 21 and 42 d in NC group were slightly decreased (P>0.05). Compared with NC group, the number of Bifidobacteria and Lactobacillus in NSP complex enzyme 1 group and NSP complex enzyme 2 group on 42 d was increased (P>0.05). 6) As the profit in PC group of 100%, adding NSP complex enzyme 1 could get the largest profit. In conclusion, dietary NSP complex enzymes in wheat-based diets with lower energy level can improve the growth performance, intestinal morphology and intestinal microorganism quantity; the economic efficiency is also improved in different degrees. In this experiment, the NSP complex enzyme 1 can obtain the best application effect.

Key words： wheat-based diet; non-starch polysaccharide enzyme; broiler; growth performance; intestinal physiology

Cite this article

WANG Dongqun , DING Xuemei , BAI Shiping , LUO Yuheng , WANG Jianping , ZENG Qiufeng , ZHANG Keying . Application Effects of Different Non-Starch Polysaccharide Complex Enzymes on Wheat-Based Diets for Broilers[J]. Chinese Journal of Animal Nutrition, 2013 , 25(10) : 2371 -2385 . DOI: 10.3969/j.issn.1006-267x.2013.10.021

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