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当前位置: 首页 > 文章 > Effects of exogenous enzymes and dietary energ on performance and digestive physiology of broilers 畜牧与生物技术杂志(英文版) 2013,4 (4) 294-302
Position: Home > Articles > Effects of exogenous enzymes and dietary energ on performance and digestive physiology of broilers Journal of Animal Science and Biotechnology 2013,4 (4) 294-302

Effects of exogenous enzymes and dietary energ on performance and digestive physiology of broilers

作  者：
Jialing Zou;Ping Zheng;Keying Zhang;Xuemei Ding;Shiping Bai
单  位：
Sichuan Agricultural University; Ya'an; Engineering Research Center for Animal Disease-Resistance Nutrition of China Ministry of Education; Sichuan; People's Republic of China;Institute of Animal Nutrition
关键词：
Broilers;Digestive physiology;Exogenous enzymes;Growth performance
摘  要：
The study was conducted to compare the effects of XG with AG and BM at different metabolizable energy diets on growth performance, digestive physiology and energy utilization of broilers fed with corn-SBM diet. A 2x4 factorial design was used with twobasal diets (the positive control group, PC; negative control with ME reduction 100 kcal/ kg, NC) and with or without the addition of three exogenous enzymes (0.02% BM; 0.01% AG; 0.05% XG) respectively. 1,200 one-day-old broilers were randomly allocatedto 8 treatments with 10 pens of 15 broilers. There was no significant difference on BW, BWG, and Fl at 0-21 d, 21 -42d or 0-42d for diet, enzymes or their interactions, but Fl at 22-42d and 0-42d were tend to be decreased with the addition of enzymes. The F/G was significantly improved by the addition of enzymes especially in NC diet. The dietary AME and TME in PC or NC diet were significantly increased by XG or AG in NC diet. The villus length and V/C of ileum were significantly increased by the addition of BM or XG. XG improved the activities of trypsin, chymotrypsin and amylase, BM improved the activity of trypsin at 21 d, and AG improved the activity of chymotrypsin at 21 d. Comparing to PC diet, the addition of enzymes in PC or NC diet decreasedfeed cost per kg body weight gain especially in NC diet (except AG in PC diet) with the highest profits for XG in NC diet. In conclusion, supplementation of 0.02% BM or 0.01% AG or 0.05% XG could improve feed conversion of broilers in corn-soybean meal diet by improving energy utilization and digestive physiology, and also supplementation of 0.05% XG had a preferable efficacy in low energy diet.

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