Abstract

CORTES CUEVAS, Arturo; MARTINEZ AMEZCUA, Carlos  and  AVILA GONZALEZ, Ernesto. Lysine bioavailability in broiler starting diets containing poultry by-product meals. Rev. mex. de cienc. pecuarias [online]. 2011, vol.2, n.3, pp.247-258. ISSN 2448-6698.

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 %.

Keywords : Poultry by-products; Broilers; Bioavailability; Lysine; Growth performance.

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