MEASUREMENT OF BIOAVAILABLE ENERGY IN POULTRY FEEDINGSTUFFS: A REVIEW | Zendy

I.R. SIBBALD | Zendy

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MEASUREMENT OF BIOAVAILABLE ENERGY IN POULTRY FEEDINGSTUFFS: A REVIEW

Author(s) -

I.R. SIBBALD

Publication year - 1982

Publication title -

canadian journal of animal science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.377

H-Index - 64

eISSN - 1918-1825

pISSN - 0008-3984

DOI - 10.4141/cjas82-123

Subject(s) - bioassay , bioavailability , nutrient , food science , environmental science , microbiology and biotechnology , biology , zoology , ecology , bioinformatics

The importance of knowing the bioavailable energy (BE) content of poultry feedingstuffs is discussed in terms of economics, feed intake and the environment. The partition of ingested dietary energy is described and the effects of nutrient intake and of the microflora of the alimentary canal are outlined. Indirect biological, physical and chemical assays for BE are described and appraised. Procedures common to several direct bioassays for BE are discussed and points to consider in choosing between total excreta collection and the use of an indicator are presented. Assays for digestible energy, apparent metabolizable energy, true metabolizable energy and net energy are described. Variables affecting estimates of BE such as bird type, assay environment, assay diet and intake, assay design, the nitrogen correction, and metabolic plus endogenous losses are considered and a bioassay is recommended. The review concludes with brief speculation about future developments in the field of feedingstuff evaluation. Key words: Review, Energy, Assays, Methodology, Bioavailable

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