Biodisponibilidad de lisina para el pollo en crecimiento de cuatro harinas de subproductos avícolas

poultry by-product meals (pbm) are potential protein and lysine sources in broiler chicken starting diets. using two experiments, lysine bioavailability was evaluated in four samples of pbm (a, b, c, and d) from a major poultry producer in mexico. in exp 1, 168 ross strain broilers (1 to 21 d of age) were used and in exp 2, 210 ross strain broilers were used (7 to 21 d of age). in both experiments, chicks were distributed randomly in seven treatments with three replicates each. treatments were 1) sorghum-soybean meal-sesame meal basal diet (lysine deficient); 2) basal diet + 0.05% l-lysine; 3) basal diet + 0.10% l-lysine; 4) basal diet + 0.05% lysine from pbm a or b; 5) basal diet + 0.10% lysine from pbm a or b; 6) basal diet + 0.05% lysine from pbm c or d; and 7) basal diet + 0.10% lysine from pbm c or d. exp 1 growth results were explained with the multiple linear regression equation: y = 265,074 + 0.04288 x1 + 0.0417 x2 + 0.04085 x3, where x1 was l-lysine, x2 was pbm a and x3 was pbm c. exp 2 growth results were explained by the equation: y = 129,131 + 0.06764x1 + 0.06437 x2 + 0.06614 x3, where x1 was l-lysine, x2 was pbm b and x3 was pbm d. comparison of the pbm slopes with the l-lysine slope (i.e. 100 % bioavailability) showed them all to have >90 % lysine bioavailability: pbm a= 97.2, pbm b = 95.2, pbm c= 95.2, and pbm d= 97.8 %.