Document Detail

Age-related influence of a cocktail of xylanase, amylase, and protease or phytase individually or in combination in broilers.
MedLine Citation:
PMID:  17179419     Owner:  NLM     Status:  MEDLINE    
This 21-d experiment was conducted to determine if the response of chicks to a cocktail of xylanase, amylase, and protease (XAP) or Escherichia coli-derived phytase individually or in combination when fed a nutritionally marginal corn-soybean meal diet is age-dependent. Six hundred 1-d-old chicks were allocated to 5 dietary treatments in a randomized complete block design. The treatments were as follows: 1) positive control with supplemental inorganic P; 2) negative control (NC) marginal in P and ME; 3) NC plus XAP to provide (per kg of diet) 650, 1,650, and 4,000 U of xylanase, amylase, and protease, respectively; 4) NC plus phytase added to provide 1,000 phytase units/kg; and 5) NC plus a combination of XAP and phytase. Low ME and P in the NC diet depressed weight gain and gain:feed (P < 0.001). A cocktail of XAP alone did not improve performance, but phytase supplementation improved (P < 0.001) weight gain. The enzymes were additive in their effects on growth performance. The enzymes had no effect on ileal digestible energy. Ileal N digestibility was higher (P < 0.05) in diet with XAP or phytase individually compared with NC. Both phytase and XAP individually and in combination improved (P < 0.01) ileal P digestibility compared with NC. Total tract nutrient retention and ME increased (P < 0.01) as the birds grew older. There were age x diet interactions (P < 0.001) on total tract retention of P and Ca; improvement in P retention due to phytase use decreased by 50% as the chicks matured. The current study shows that a combination of XAP and phytase improved performance, but the enhancement in performance appears to be mainly from phytase. Both XAP and phytase were effective in improving P digestibility and retention of chicks receiving nutritionally marginal corn-soybean meal. The data also shows that the chicks benefited more from the enzyme addition at a younger age and that the contribution of the enzymes to nutrient retention decreased with age in chickens.
O A Olukosi; A J Cowieson; O Adeola
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Poultry science     Volume:  86     ISSN:  0032-5791     ISO Abbreviation:  Poult. Sci.     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2006-12-20     Completed Date:  2007-03-21     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0401150     Medline TA:  Poult Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  77-86     Citation Subset:  IM    
Department of Animal Sciences, Purdue University, West Lafayette, IN 47907, USA.
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MeSH Terms
6-Phytase / administration & dosage,  pharmacology*
Aging / physiology*
Amylases / administration & dosage,  pharmacology*
Animal Feed
Animal Nutritional Physiological Phenomena / drug effects
Chickens / growth & development*
Diet / veterinary
Digestion / drug effects*
Drug Therapy, Combination
Energy Metabolism
Peptide Hydrolases / administration & dosage,  pharmacology*
Weight Gain
Xylosidases / administration & dosage,  pharmacology*
Reg. No./Substance:
EC; EC 3.2.1.-/Amylases; EC 3.2.1.-/Xylosidases; EC 3.4.-/Peptide Hydrolases

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