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Response of Older Broiler Breeders to Medium-High Intakes of Protein

Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada; Phone: (519) 824-4120, Ext. 3681; FAX: (519) 836-9873

Correspondence: Steve Leeson

This experiment attempted to evaluate both the effects of high dietary protein on older broiler breeders and subsequent offspring performance. Caged birds received diets containing four different levels (14, 16, 18, or 20%) of crude protein, providing 21, 24, 27, or 30 g crude protein/bird/day for a 10-wk period. Diets were isoenergetic and contained similar levels of methionine and lysine (0.38% and 0.90%, respectively). Throughout this experiment all hens were artificially inseminated with pooled semen. Egg production was lower (P<. 01) with the highest protein intake. No effects attributable to protein intake were observed for weight, egg composition, body weight, or hatchability of fertile eggs. Broiler offspring growth was not affected by breeder nutrition.

Key Words: Amino acids • broiler breeders • chick weight • egg composition • egg weight • hatchability • proteins