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Threonine Supplementation of Practical Diets for 3- to 60 Wk-Old Broilers

Department of Poultry Science, The University of Georgia, Athens, GA 30602-2772; Phone: (706) 542-1346; FAX: (706) 542-1827

Correspondence: Leo S. Jensen

Threonine is generally considered the third limiting amino acid after methionine and lysine in broiler production. Less information is available on the quantitative requirement of threonine for older broilers than for birds during the starter phase. The experiments reported here suggest that the threonine requirement for male broilers from 3 to 6 wk of age fed a 20% protein diet containing 3200 kcal ME/kg is no higher than 0.70%. The requirement for females is less. These requirement estimates are lower than those given in the 1994 National Research Council report.

Key Words: Abdominal fat • broilers • feed efficiency • growth rate • threonine

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