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Effect of Age on Feather Amino Acid Content in Two Broiler Strain Crosses and Sexes

Heartland Lysine, Inc., 8430 W. Bryn Mawr Avenue, Suite 650, Chicago, IL 60631; Phone (773) 380-7000; FAX: (773) 380-7006

E. T. Moran, Jr.

Auburn University, Auburn, AL 36849-5416

R. M. Gous

University of Natal, Pietermaritzburg, South Africa 3200

M. D. Harrison

A. E. Staley Manufacturing Co., Decatur, IL 62525

Correspondence: H. L. Stilborn

A description of the feather amino acid content from two distinct broiler strain crosses may provide needed information for nutritional purposes. Both sexes of the Ross x Arbor Acre and Steggle x Arbor Acre strain crosses were reared on corn-soybean meal-based diets exceeding the minimum NRC (1984) nutrient recommendations, with pooled feather samples taken from selected birds for amino acid analyses at different ages.

Broiler age played a greater role than strain cross or sex in influencing individual and total essential amino acid contents. Total non-essential amino acids as a percentage of total essential amino acids increased as the bird aged, indicating feather compositional changes occurring during this time.

Key Words: Age • broiler • feather amino acids • sex • strain cross