The experiment was carried out with the objective of evaluating the ileal endogenous losses of amino acids in function of different fiber levels inclusion in a free protein diet. Were used eight crossbreed swine, castrated males, averaging 50.17 ± 4.10 kg initial weight, submitted previously to the simple T canula surgery implantation, allotted to a randomized blocks design, with four treatments, four replicates and one animal per experimental unit. The treatments consisted in a free protein diet with four levels of rice husks inclusion, that provided levels of 1.00, 2.00, 3.00, and 4.00% of crude fiber and/or 1.82, 3.64, 5.46, and 7.28% neutral detergent fiber. Contents of dry matter, crude protein, chromium and amino acids of the ilel samples and experimental rations were determined. It was observed a great variation among the amino acids endogenous losses, within treatments. It was concluded that, among the studied amino acids, just the glycine did not show significant effect to the fiber levels inclusion in the free protein diet, and there was an increase in the endogenous losses of the other amino acids, as the fiber levels in the diet increased.
amino acids; endogenous losses; fiber; swine
