title: Dietary protein and amino acids-consideration of the undigestible fraction.
abstract: A case is made for the application of true ileal amino acid digestibility and true ileal reactive lysine digestibility (lysine availability) in poultry nutrition. Technical aspects of the true ileal digestibility assays are reviewed, as are factors influencing amino acid digestibility in the broiler. There is considerable variation in amino acid digestibility and lysine availability both within and among diverse feedstuffs. Differences in mean amino acid digestibility among feedstuffs, and the variability in the digestibility of an amino acid within a feedstuff should both be taken into account during least-cost dietary formulation.
authors.affiliation: Riddet Institute, Massey University, Private Bag 11-222, Palmerston North 4442, New Zealand p.j.moughan@massey.ac.nz.
authors.forename: Paul J
authors.initials: PJ
authors.lastname: Moughan
authors.affiliation: Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Private Bag 11-222, Palmerston North 4442, New Zealand.
authors.forename: V
authors.initials: V
authors.lastname: Ravindran
authors.affiliation: DSM Nutritional Products, Animal Nutrition & Health, Av. Eng° Billings, 1729, São Paulo, Caixa Postal 3003, Brazil.
authors.forename: J O B
authors.initials: JO
authors.lastname: Sorbara
mesh_terms: D000596:Amino Acids / Q000378:metabolism*; D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D002645:Chickens / Q000502:physiology; D004032:Diet / Q000662:veterinary; D004044:Dietary Proteins / Q000378:metabolism*; D004063:Digestion; D007082:Ileum / Q000378:metabolism*; D008239:Lysine / Q000378:metabolism; D011200:Poultry / Q000502:physiology*
chemical_list: D000596:Amino Acids; D004044:Dietary Proteins; D008239:Lysine
keywords: enzyme; method; protease