1. Scott, M.L.; Dean, W.F. Nutrition and Management of Ducks; M.L. Scott of Ithaca: Ithaca, NY, 1991.

2. National Research Council. Nutrient Requirements of Poultry; National Academy Press: Washington, DC, 1994.

3. Elkin, R.G.; Stewart, T.S.; Rogler, J.C. Methionine requirement of male white Pekin ducklings. Poult. Sci. 1986, 65, 1771 1776.

4. Bons, A.; Timmler, R.; Jeroch, H. Lysine requirement of growing male Pekin ducks. Br. Poult. Sci. 2GG2, 43, 677 686.

John A. Milne

The Macaulay Institute, Aberdeen, U.K.

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