Methods for measuring ileal amino acid digestibility in pigs.
- Publikations-Art
- Buchbeitrag
- Autoren
- Sauer, W.C., M.Z. Fan, R. Mosenthin, W.Drochner
- Erscheinungsjahr
- 2000
- Veröffentlicht in
- Farm Animal Metabolism and Nutrition
- Herausgeber
- J.P.F. D'Mello
- Verlag
- CABI Publishing , Wallingford / UK
- ISBN / ISSN / eISSN
- 0-85199-378-8
- Seite (von - bis)
- 279-306
- Schlagworte
- digestibility, ileal amino acid, pig
Conclusion: .... Apparent ileal amino acid digestibility values from the literature, determined with the ileal analysis method, were reviewed and showed considerable variation among different samples of the same feedstuff. The variation in ileal amino acid digestibility values within the same feedstuff was reviewed for cereal grains, protein supplements and legume seeds. In addition to different processing conditions and inherent factors among samples of the same feedstuff, a large proportion of the differences can be attributed to approaches in methodology. Differences in dietary amino acid levels are likely to be the largest single contributor to the variation of ileal amino acid digestibility values within the same feedstuff. Dietary amino acid levels quadratically affect ileal amino acid digestibility values. In order to remove the effect of dietary amino acid levels, the plateau apparent ileal amino acid digestibility values should be determined. Finally, methods of determination can also result in differences in ileal amino acid digestibility values within the same feedstuff. In order to eliminate this variation, methods of determination specifically suited for different feedstuffs are recommended. For cereal grains, the regression and the difference method rather than the direct method should be used. For most protein supplements, the direct, the difference and the regression methods are all suited for the determination. However, for feedstuffs including some protein supplements and by-products that can only be included at low levels in the assay diets, the regression rather than the direct or the difference method should be used.