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Threonine Responses in Commercial Broilers at 30 to 42 Days

Nutri-Quest, Inc., 1400 Elbridge Payne Road, Chesterfield, MO 63017; Phone: (314) 537-4057; FAX: (314) 532-1710

Correspondence: M. T. Kidd

Threonine is typically the third limiting amino acid in corn and soybean meal diets for broilers. However, reported threonine requirement values for broiler vary greatly, and the threonine requirement for growing broilers has been studied little. It is important to accurately meet threonine requirements for maintenance and tissue accretion as the bird ages.

Commercial broilers were fed threonine-deficient experimental diets composed of grain sorghum, peanut meal, corn, and poultry meal from 30 to 42 days of age. Performance of commercial broilers fed experimental diets containing surfeit threonine was equal to that of birds fed the corn and soybean meal control diet. Results indicate that the 21 to 42 day NRC threonine requirement of 0.74% of diet is too high, based on the 30 to 42 day weight gain and feed:gain response. However, the 30 to 42 threonine requirement for breast traits may be higher than that of performance criteria. Future research should address threonine requirements in mature broilers for carcass traits.

Key Words: Breast meat yield • broiler • chicken • threonine

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