The experiment was carried out with the objective of determining the apparent and true ileal digestibilities of amino acids from five different poultry by-product. Ten crossbreed swines, castrated males, averaging 31.11 ± 3.88 kg were used in the experiment. The animals were previously submitted to the surgery for simple T canula implantation and, then, allotted to a randomized block design with five treatments, four replicates and one animal per experimental unit. At the end of the first and second replicates, these animals were allotted again to the treatments and used in the third and fourth replicates. The treatments consisted of a free protein diet based on sugar, starch, vegetable oil and rice peel and one of the five poultry by-product as protein source in the diet. The coefficients of apparent ileal digestibility of lysine, threonine and methionine of different poultry by-product ranged from 63.40 to 74.01, 63.17 to 79.13 and 72.60 to 81.11%, respectively, and the coefficients of true ileal digestibility, from 64.38 to 74.88, 64.31 to 80.60 and 73.07 to 81.64%, respectively.
amino acids; ileal digestibility; poultry by-product; swine
