Research Notes Comparison of Nicarbazin Absorption in Chickens, Mallards, and Canada Geese

monly used in the poultry industry, causes reduced hatchability and egg quality in layer hens at a concentra-tion of 125 ppm (8.4 mg/kg) in the feed. Although this effect is undesirable in the poultry industry, NCZ could provide a usefulwildlife contraception tool forwaterfowl, particularly urban geese. We tested the absorption of NCZ in chickens (Gallus gallus), mallards (Anas platy-rhynchos), and Canada geese (Branta canadensis) gavaged with 8.4 mg of NCZ/kg per bird each day for 8 d. Plasma levels of 4,4′-dinitrocarbanilide (DNC) differed signifi-cantly among species. Peak plasma DNC levels were 2.8