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Effect of Casein and Soy Protein Diets on the Growth of Ducklings¹

Department of Biochemistry, State University of New York, Upstate Medical Center, Syracuse, New York

The maximal growth rate of ducklings was obtained with a 30 to 35% soy protein diet (supplemented with methionine and glycine), but not with 35% casein or 25% casein plus 10% gelatin. Ducks responded like chicks and turkey poults in this respect, but unlike the latter, ducklings did not require a source of the fish-soluble factor for maximal growth. The better growth obtained with 35% soy protein as compared with 35% casein could not be attributed to differences in the amino acid composition of the 2 proteins, since a growth differential still existed when both diets were made equal in amino acid composition. The 25 to 35% casein diets supported the maximal growth rate when supplemented with 10% cottonseed meal.

Manuscript received 27 October 1964.