Document Detail

Microbial phytase does not improve protein-amino acid utilization in soybean meal fed to young chickens.
MedLine Citation:
PMID:  11385069     Owner:  NLM     Status:  MEDLINE    
Three growth trials were conducted with young chicks to evaluate crude protein (CP) utilization in soybean meal (SBM) as affected by dietary addition of microbial phytase. In assay 1, chicks were fed two CP-deficient (50 or 150 g CP/kg) levels of dehulled SBM, and each SBM level was then supplemented with equimolar amounts of cystine or methionine (Met) or with 1200 U phytase/kg. At 50 g CP/kg, cystine or Met supplementation improved (P < 0.05) measures of growth performance, but when 150 g CP/kg from SBM was fed, only Met addition improved (P < 0.05) weight gain, food efficiency and protein efficiency ratio (PER). Thus, Cys was more limiting than Met in the diet that contained 50 g CP/kg, but Met was clearly first-limiting in the diet that contained 150 g CP/kg. Phytase supplementation did not improve (P > 0.10) chick performance at either level of CP. Chicks in assay 2 were fed 100 g CP/kg furnished by SBM, casein or corn gluten meal in the absence and presence of 1200 U phytase/kg. Weight gain, gain/food and PER values were greater (P < 0.05) in chicks fed SBM than in those fed casein, and greater (P < 0.05) in chicks fed casein than in those fed corn gluten meal. Phytase supplementation had no effect (P > 0.10) on any measure of chick performance, regardless of the protein source fed. In assay 3, three deficient levels of CP (50, 100 and 150 g/kg) from SBM were fed in the absence and presence of 1200 U dietary phytase/kg. Weight gain, food efficiency and protein accretion increased linearly (P < 0.05) as a function of protein intake, but phytase supplementation had no effect (P > 0.10) on slopes of the body weight and protein accretion curves. Likewise, phytase addition did not affect (P > 0.10) measures of protein utilization, i.e., weight gain/protein intake and protein gain/protein intake at any of the CP levels that were fed. Because sulfur amino acids are the growth-limiting factors when protein-deficient levels of SBM are fed to young chicks, we conclude that dietary addition of phytase does not improve sulfur amino acid utilization in SBM.
C M Peter; D H Baker
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of nutrition     Volume:  131     ISSN:  0022-3166     ISO Abbreviation:  J. Nutr.     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2001-05-31     Completed Date:  2001-06-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0404243     Medline TA:  J Nutr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1792-7     Citation Subset:  IM    
Department of Animal Sciences and Division of Nutrition Sciences, University of Illinois, Urbana, Illinois 61801, USA.
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MeSH Terms
6-Phytase / administration & dosage*
Administration, Oral
Amino Acids / metabolism*
Animal Feed
Body Weight
Chickens / growth & development,  metabolism*
Dietary Supplements*
Proteins / metabolism*
Soybean Proteins / administration & dosage*,  metabolism
Reg. No./Substance:
0/Amino Acids; 0/Proteins; 0/Soybean Proteins; EC

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

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