J. Appl. Poult. Res.
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J APPL POULT RES 2000. 9:214-222
© 2000 Poultry Science Association
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Research Reports

Threonine Requirements for Broiler Males from 42 to 56 Days of Age

W. A. Dozier, III and E. T. Moran, Jr.

Poultry Science Department and Alabama Agricultural Research Station, Auburn University, AL 36849-5416; Phone: (334) 844-2619; FAX: (334) 844-2641

M. T. Kidd

Nutri-Quest, Inc., 1400 Elbridge Payne Road, Suite 110, Chesterfield, MO 63107

Correspondence: E. T. Moran, Jr., E-mail:emoran{at}acesag.auburn.edu

Threonine adequacy was assessed in male broilers from 42 to 56 days of age. A common feeding regimen was given for the first 6 wk. Then six concentrations of threonine were fed ranging from 0.50 to 0.80% in progressive increments of 0.06%. Growth rate and feed/gain were optimized at approximately 0.68 and 0.67% dietary threonine, respectively. Threonine needed to maximize relative carcass yield increased to 0.75%, whereas the amount to fully recover breast fillet weight and its relative yield was 0.70%. The proportions of abdominal fat and carcass defects were unaltered. The threonine requirement to optimize live performance is less than that needed for complete recovery of whole carcass and its breast fillets.

Key Words: Amino acid • breast meat • broiler • threonine




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