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Assessing the threonine-to-lysine ratio of female broilers from 14 to 28 days of age¹

A. Corzo^*,2, W. A. Dozier, III, R. E. Loar, II^*, M. T. Kidd^* and P. B. Tillman

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

² Corresponding author: acorzo{at}poultry.msstate.edu

Diets for straight-run broiler flocks are often formulated to meet the nutrient requirements of male broilers, assuming this will cover the nutrient needs of the females. Delineating the nutrient needs of female broilers may allow for a more precise formulation and may lead to a reduction in associated feed cost, particularly when feeding sexes separately. A study was designed to simultaneously evaluate the dietary needs of Lys and Thr of a high-yielding female broiler from 14 to 28 d of age. Dose-response diets were accomplished via the diet-dilution technique, and were formulated to provide a range from 0.84 to 1.24% and 0.46% to 0.86% standardized digestible Lys and Thr, respectively. Requirement estimates ranged from 1.06 to 1.11% for standardized digestible Lys, depending on the parameter and the statistical method used, whereas Thr requirement estimates ranged between 0.73 and 0.79%. In addition to the aforementioned requirement estimates, Thr-to-Lys ratios of 69 for BW gain and 70 for FCR were calculated.

Key Words: broiler • lysine • threonine

¹ This is journal article number J11441 from the Mississippi Agricultural and Forestry Experiment Station supported by MIS-322220. Use of trade names in this publication does not imply endorsement by the Mississippi Agricultural and Forestry Experiment Station and USDA-ARS of the products, nor of similar ones not mentioned.