Document Detail


Phytic acid and phytase: implications for protein utilization by poultry.
MedLine Citation:
PMID:  16673766     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effect of the ingestion of myo-inositol hexaphosphate (IP6) and phytase (EC 3.1.3.26) on the digestibility of casein was investigated using growing broiler chickens. A total of 64 female Ross broilers were used in a precision feeding study. One group of 8 birds was fed a solution of glucose to estimate endogenous losses. Seven groups, each of 8 birds, were fed either casein, casein + 1,000 units of phytase activity (FTU), casein + 2,000 FTU, casein + 0.5 g of IP6, casein + 0.5 g of IP6 + 1,000 FTU, casein + 1 g of IP6, or casein + 1 g of IP6 + 1,000 FTU. The excretion of DM, amino acids, nitrogen, minerals, and phytate-phosphorus was determined over a 48-h period and nutrient digestibility coefficients were calculated. Casein was found to be highly digestible, with true coefficients of DM, N, and amino acid digestibility of between 0.85 and 1.0. However, the ingestion of IP6 reduced (P < 0.05) the digestibility coefficients of amino acids, N, and DM of casein compared with birds fed casein alone. Supplementation of the mixture of casein and IP6 with phytase improved (P < 0.05) the digestibility coefficients of amino acids compared with birds fed on casein and IP6 with no supplemental phytase. The excretion of endogenous minerals was increased (P < 0.05) by the ingestion of IP6 and reduced (P < 0.05) by the supplementation of IP6 with phytase. In the absence of exogenous phytase, the recovery of phytate-P in excreta was approximately 80%. However, the recovery of phytate-P was significantly reduced by the addition of exogenous phytase to the IP6/casein mixture. It can be concluded that the ingestion of IP6 reduces the digestibility coefficients of amino acids and the metabolizability of nitrogen of casein. This is likely to be mediated partially through increased endogenous losses. However, the addition of phytase can partially ameliorate the detrimental effects of IP6 on protein utilization.
Authors:
A J Cowieson; T Acamovic; M R Bedford
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Poultry science     Volume:  85     ISSN:  0032-5791     ISO Abbreviation:  Poult. Sci.     Publication Date:  2006 May 
Date Detail:
Created Date:  2006-05-05     Completed Date:  2006-06-19     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0401150     Medline TA:  Poult Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  878-85     Citation Subset:  IM    
Affiliation:
Avian Science Research Centre, Scottish Agricultural College, Ayr, UK.
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MeSH Terms
Descriptor/Qualifier:
6-Phytase / administration & dosage,  metabolism,  pharmacology*
Animal Nutritional Physiological Phenomena
Animals
Caseins / metabolism*
Chickens / metabolism*
Digestion* / drug effects
Dose-Response Relationship, Drug
Feces / chemistry
Female
Nitrogen / analysis,  metabolism
Phytic Acid / administration & dosage,  metabolism,  pharmacology*
Random Allocation
Chemical
Reg. No./Substance:
0/Caseins; 7727-37-9/Nitrogen; 83-86-3/Phytic Acid; EC 3.1.3.26/6-Phytase

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


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