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

Journal of Animal Science and Biotechnology

Shiping Bai¹  Xuemei Ding¹  Keying Zhang¹  Ping Zheng¹  Jialing Zou¹ 

[1] Institute of Animal Nutrition, Engineering Research Center for Animal Disease-Resistance Nutrition of China Ministry of Education, Sichuan Agricultural University, Ya'an, Sichuan, People’s Republic of China

关键词: Growth performance;    Exogenous enzymes;    Digestive physiology;    Broilers;   

Others  :  805605
DOI  :  10.1186/2049-1891-4-14

 received in 2012-12-07, accepted in 2013-03-25,  发布年份 2013

【 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 2 × 4 factorial design was used with two basal 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 allocated to 8 treatments with 10 pens of 15 broilers. There was no significant difference on BW, BWG, and FI at 0-21d, 21-42d or 0-42d for diet, enzymes or their interactions, but FI 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 21d, and AG improved the activity of chymotrypsin at 21d. Comparing to PC diet, the addition of enzymes in PC or NC diet decreased feed 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.

【 授权许可】

   
2013 Zou et al.; licensee Bio MedCentral Ltd.

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