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Nitrogen Content of Manure from Older Broiler Breeders Fed Varying Quantities of Crude Protein

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

Correspondence: Steve Leeson

Two experiments attempted to evaluate the nitrogen balance of older broiler breeder hens fed different levels of dietary protein while maintaining adequate levels of limiting amino acids. The study also evaluated the relationship between the intake, retention, and output of nitrogen as well as the uric acid output of the birds. In Experiment 1 (14 to20% CP diets), nitrogen and uric acid excretion increase linearly (P<. 01) with nitrogen intake. Proportional nitrogen retention decreased linearly (P<. 01) with increased dietary protein. In Experiment 2 (9 to 15% CP diets), both nitrogen and uric acid excretion increased linearly (P<. 05) with nitrogen intake. Also, a trend was observed of nitrogen retention (g/bird/day) increasing as dietary protein increased. Results indicate that an increase of nitrogen intake is positively correlated with nitrogen output, a finding suggesting that higher nitrogen intake does not cause higher nitrogen retention.

Key Words: Amino acid • broiler breeder • nitrogen balance • protein

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