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Digestible lysine requirements of male and female broilers from fourteen to twenty-eight days of age¹

W. A. Dozier, III^*,3,2, A. Corzo, M. T. Kidd, P. B. Tillman and S. L. Branton^*

^* USDA-Agricultural Research Service, Poultry Research Unit, Mississippi State, MS 39762; Department of Poultry Science, Mississippi State University, Mississippi State 39762; and Ajinomoto Heartland LLC, Chicago, IL 60631

³ Corresponding author: bill.dozier{at}auburn.edu

There is little research data available on the digestible Lys requirement of broilers from 2 to 4 wk of age. Two experiments were conducted to determine the digestible Lys requirements of male and female Ross x Ross TP16 broilers from 14 to 28 d. Two diets (dilution and summit) consisting of corn, soybean meal, poultry by-product meal, and peanut meal were formulated to be adequate in all other amino acids. The dilution and summit diets were blended to create 9 titration diets. A control diet containing adequate Lys was used for comparison with the titration diets. A true Lys digestibility assay was conducted with cecectomized roosters to determine the values for the dilution (low) and summit (high) diets. True digestible Lys of the low and high dose-response diets were determined to be 0.84 and 1.21%, respectively. Body weight gain, feed intake, digestible Lys intake, digestible Lys intake:BW gain, feed conversion, and mortality were assessed during experimentation. Digestible Lys requirements were estimated using a quadratic broken-line model and a quadratic regression equation based on 95% of the optimum response. In experiment 1, the digestible Lys requirement for male Ross x Ross TP16 broilers was determined to be between 1.07 and 1.09% and 1.10 and 1.15%, for BW gain and feed conversion, respectively. In experiment 2, the digestible Lys requirement for female Ross x Ross TP16 broilers was estimated as 0.98% for BW gain determined with a quadratic broken-line model and 1.03 and 0.99% for feed conversion, respectively, using a quadratic regression equation based on 95% of the optimum response and the quadratic broken-line model. Digestible Lys requirements for male and female Ross x Ross TP16 broilers were estimated at 1.10 and 1.00%, respectively, based upon BW gain and feed conversion averaged for both statistical models.

Key Words: digestible lysine • body weight gain • feed intake • feed conversion • mortality

¹ Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the USDA or Mississippi State University.

² Current address: Auburn University, Department of Poultry Science, 201 Poultry Science Building, 260 Lem Morrison Drive, Auburn, AL 36849-5416.