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Nutritional Studies with the Duck

IV. The Effect of Vitamin Deficiencies on the Course of P. Lophurae Infection in the Duck and the Chick¹

Department of Nutrition, Harvard School of Public Health, and Department of Biological Chemistry, Harvard Medical School, Boston

The effects of nicotinic acid, thiamine, choline, and vitamin A deficiency on the course of P. lophurae infections in chicks and ducklings are reported.

In chicks, vitamin A deficiency appears to cause a somewhat milder infection and choline deficiency may have the opposite effect. Thiamine deficiency appeared to have no influence on the infection. Nicotinic acid deficiency resulted in a much more severe infection. The percentage of parasitized cells was from four to five times greater in the deficient birds. Both deficient and nondeficient birds were able to clear the blood stream of parasites in approximately the same length of time.

In ducks none of the deficiencies influenced the course of the infection to a marked degree. The duck is probably too susceptible to this infection to be a satisfactory experimental animal.

Manuscript received 18 July 1946.