Document Detail

Prediction of ingredient quality and the effect of a combination of xylanase, amylase, protease and phytase in the diets of broiler chicks. 1. Growth performance and digestible nutrient intake.
MedLine Citation:
PMID:  16905475     Owner:  NLM     Status:  MEDLINE    
1. A total of 2208 broiler chicks were used in two growth experiments (8 treatments and 12 replicate pens in each experiment) to assess the effects of xylanase, amylase, protease and phytase in maize-based diets. 2. A positive control diet was formulated containing adequate nutrient concentrations. A negative control diet was formulated to contain approximately 628 kJ/kg, 0.13%, 0.12% and 1 to 2% less metabolisable energy (ME), phosphorus (P), calcium (Ca) and amino acids, respectively, than the positive control. In addition, two further negative control diets that contained 167 or 334 kJ/kg more ME, respectively, than negative control 1 were formulated. 3. A further 4 dietary treatments were made by supplementing each of the 4 negative control diets with a combination of xylanase, amylase, protease and phytase, resulting in 8 dietary treatments in a 4 by 2 factorial arrangement. 4. The scale of the removal of energy, P, Ca and amino acids from the positive control diet was determined using least square models based on in vivo data for both the xylanase/amylase/protease cocktail and for phytase and it was predicted that performance of birds fed on negative control 1 would be returned by supplemental enzymes to that of those fed on the positive control. 5. In both experiments there was a significantly poorer performance in birds fed on the negative control 1 than in those fed on the positive control. The poorer weight gain and feed conversion ratio could be attributed in part to a reduced intake of digestible energy, P, nitrogen (N) and amino acids associated with birds fed on the negative control diet. 6. Supplementation of the negative control diets with the enzyme combination returned performance to that of the positive control in both experiments. 7. These data indicate that exogenous xylanase, amylase, protease and phytase can be used successfully in a strategically formulated low nutrient density diet to maintain performance to that of birds fed on a nutritionally adequate diet.
A J Cowieson; D N Singh; O Adeola
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  British poultry science     Volume:  47     ISSN:  0007-1668     ISO Abbreviation:  Br. Poult. Sci.     Publication Date:  2006 Aug 
Date Detail:
Created Date:  2006-08-14     Completed Date:  2006-10-13     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  15740290R     Medline TA:  Br Poult Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  477-89     Citation Subset:  IM    
Danisco Animal Nutrition, Marlborough, Wiltshire, UK.
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MeSH Terms
6-Phytase / pharmacology*
Amylases / pharmacology*
Animal Feed
Animal Nutritional Physiological Phenomena
Chickens / growth & development*
Diet / veterinary
Dietary Supplements
Endo-1,4-beta Xylanases / pharmacology*
Peptide Hydrolases / pharmacology*
Weight Gain / drug effects
Reg. No./Substance:
EC; EC 3.2.1.-/Amylases; EC,4-beta Xylanases; EC 3.4.-/Peptide Hydrolases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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