Document Detail

Endogenous losses of energy and amino acids in birds and their effect on true metabolisable energy values and availability of amino acids in maize.
MedLine Citation:
PMID:  14965092     Owner:  NLM     Status:  MEDLINE    
1. Endogenous losses of amino acids (EAAL) and energy (EEL) were determined in unfed adult cockerels. The intercepts of linear regression analysis were determined using 44 birds precision-fed on maize. During the experimental period (48 h), excreta of birds were collected, and the samples of maize and the excreta were dried, ground and assayed for gross energy and amino acids. 2. The EAAL and EEL in unfed cockerels influenced true available amino acid (TAAA) values. Therefore, the intercept of regressions showed an increase in TAAA values of maize. 3. The results indicated that there was no significant difference between the data obtained for EEL from the unfed birds and from regression analysis so, the figure from regression analysis could be used for calculating the true metabolisable energy (TME) value of maize. 4. The calculated EAAL from regression analysis caused an increase in the TAAA value in maize. The amounts of metabolic and endogenous amino acid excretions varied in voided excreta from unfed birds. These differences would be related to genetics, age, sex and environmental temperatures.
A Yaghobfar; M Zahedifar
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  British poultry science     Volume:  44     ISSN:  0007-1668     ISO Abbreviation:  Br. Poult. Sci.     Publication Date:  2003 Dec 
Date Detail:
Created Date:  2004-02-13     Completed Date:  2004-04-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  15740290R     Medline TA:  Br Poult Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  719-25     Citation Subset:  IM    
Animal Science Research Institute, Karaj, Iran.
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MeSH Terms
Amino Acids / metabolism*,  pharmacology*
Animal Feed*
Biological Availability
Energy Intake
Energy Metabolism*
Regression Analysis
Zea mays*
Reg. No./Substance:
0/Amino Acids

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