Amino acid digestibility measurements of feedstuffs - lessons from poultry studies

Ravindran, V. and Bryden, W. L. (2007). Amino acid digestibility measurements of feedstuffs - lessons from poultry studies. In: , Poultry Science: Annual Meeting Abstracts. American Poultry Science Association Meeting, San Antonio Texas, USA, (476-476). 8-12 July 2007.

Author Ravindran, V.
Bryden, W. L.
Title of paper Amino acid digestibility measurements of feedstuffs - lessons from poultry studies
Conference name American Poultry Science Association Meeting
Conference location San Antonio Texas, USA
Conference dates 8-12 July 2007
Proceedings title Poultry Science: Annual Meeting Abstracts   Check publisher's open access policy
Place of Publication Chicago, Ill
Publisher Poultry Science Association
Publication Year 2007
ISSN 1525-3171
0032-5791
Volume 86
Issue Supplement
Start page 476
End page 476
Total pages 1
Language eng
Abstract/Summary It is now accepted that the analysis of ileal contents rather than of excreta is a more reliable method for assessing amino acid (AA) digestibility of feedstuffs for poultry. However, a major problem faced by the users of currently available digestibility databases is the confusion that exists about various terminologies used to describe AA digestibility, highlighting the need in the industry to agree on a standard methodology to measure and describe AA digestibility estimates. Lessons learnt from ileal digestibility assays, which were developed in our Laboratory for a large-scale survey of poultry feedstuffs, will be discussed and a standard mehodology for poultry digestibility assays will be presented. The relative merits of apparent and true digestible AA systems, however, will continue to be a subject of debate among nutritionists. The measurement of true digestibility includes a correction for endogenous AA secretions determined in the same digestibility assay. The concept of standardized digestibility system that overcomes the limitations of apparent and true digestible AA systems will be discussed. This system is comparable to true digestibility system, with the only difference being that it involves a correction for basal endogenous losses that need not be determined in the same digestibility assay. The basal endogenous AA loss is dened as the minimal loss of endogenous AA which occurs irrespective of feed ingredient or dietary composition and could be measured by feeding of low levels of highly digestible proteins (e.g. casein, wheat gluten) or the regression method. However, only limited published data is available on the endogenous amino acid losses at the distal data is available on the endogenous amino acid losses at the distal ileum of poultry. Since the transformation to standardized digestibility values will require reliable estimates of basal endogenous amino acid losses at the ileal level, further research on this subject is warranted. Some key areas for future research will be highlighted.
Subjects 070204 Animal Nutrition
Keyword Amino Acid Digestibility
Endogenous Losses
Poultry

Document type: Conference Paper
Collection: School of Agriculture and Food Sciences
 
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