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Interactive Effects of Lysine and Threonine on Live Performance and Breast Yield in Male Broilers

Nutri-Quest, Inc., 1400 Elbridge Payne Road, Suite 110, Chesterfield, MO 63017-8520; Phone: (636) 537-4057; FAX: (636) 532-1710

M. T. Kidd

Mississippi State University, Mississippi State, MS 39762-9665

G. W. McWard

Global Poultry Consulting, Inc., 2602 Lindsey Grace Lane, Buford, GA 30519

C. L. Quarles

Colorado Quality Research, 400 East County Road 72, Wellington, CO 80549

Correspondence: B. J. Kerr, E-mail:nutri-quest{at}biokyowa.com

The TSAA, lysine (Lys), and threonine (Thr) are considered to be the first three limiting amino acids, respectively, in a corn-soybean meal diet fed to broilers. Recent data have clearly demonstrated that feeding broilers diets containing higher than recommended levels of Lys improves broiler performance and edible meat production. In contrast, there is limited data concerning the Thr nutrition of modern broilers selected for breast meat yield. Because essential amino acids are known to interact with one another to improve certain production function, this experiment attempted to describe the relationship between dietary Lys and Thr. This experiment measured the effect of adequate and super-adequate levels of dietary Lys as affected by Thr concentrations ranging from deficient to super-adequate. Increasing the concentration of dietary Lys from 105% to 120% of the NRC recommendation improved body weight gain, feed conversion, carcass yield, breast meat weight, and breast meat yield. Regardless of dietary Lys concentration, increasing dietary Thr from 85% to 92.5% of the NRC recommendation appeared to be adequate for broiler body weight gain and feed conversion. Dietary Lys and Thr interacted on breast meat weight (P<. 10) so that 100.0% of the NRC recommendation for Thr was required to maximize breast meat deposition in broilers fed the 105% Lys diets, but 107.5% Thr was necessary to maximize breast meat in broilers fed the 120% Lys diets.

Key Words: Breast meat yield • lysine • threonine

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