Document Detail

beta-Mannanase ameliorates viscosity-associated depression of growth in broiler chickens fed guar germ and hull fractions.
MedLine Citation:
PMID:  14717550     Owner:  NLM     Status:  MEDLINE    
High concentrations of guar meal in broiler chicken diets reduce body weight and feed efficiency. The increased intestinal viscosity that is responsible for reduced measures of performance results from residual guar gum present in guar meal. Two experiments were designed to study the effects of 2 guar meal fractions at 3 different concentrations, germ (0, 5.0, and 7.5%) and hull (0, 2.5, and 5.0%), and the effectiveness of a beta-mannanase at three levels (0, 1x, and 4x; 1x = 1.09 x 10(5) units/ kg) on broiler growth and feed conversion. Growth and performance were measured as a function of intestinal viscosity. Addition of the germ fraction to rations did not reduce body weight, although feed conversion ratio was increased at 7.5% of the diet. Intestinal viscosity also increased significantly at this level. Enzyme addition significantly reduced intestinal viscosity. Due to an interaction that was present between hull and enzyme concentration, each treatment was compared separately. Inclusion of the hull fraction significantly reduced body weight at both levels of inclusion and increased feed conversion ratio at 5% inclusion. Addition of the enzyme significantly increased body weight and reduced feed conversion ratio in diets containing guar hull fractions. Supplementation of beta-mannanase to feeds containing either fraction of guar meal reduced intestinal viscosity and alleviated the deleterious effects associated with guar meal feeding.
J T Lee; C A Bailey; A L Cartwright
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Poultry science     Volume:  82     ISSN:  0032-5791     ISO Abbreviation:  Poult. Sci.     Publication Date:  2003 Dec 
Date Detail:
Created Date:  2004-01-13     Completed Date:  2004-02-09     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0401150     Medline TA:  Poult Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1925-31     Citation Subset:  IM    
Poultry Science Department, Texas A&M University, College Station, Texas 77843-2472, USA.
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MeSH Terms
Animal Nutritional Physiological Phenomena
Chickens / growth & development*
Intestines / physiology
Plant Structures
beta-Mannosidase / administration & dosage*
Reg. No./Substance:

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