To the Editor

Loew F. M. Bettany J. M. Halifax C. E. : Apparent thiamin status of cattle and its relationship to polioencephalomalacia. Can J Comp Med 39: 291–295, 1975

National Research Council/National Academy of Sciences: Nutrient Requirements of Dogs, pp. 21–22; 2–9; 19–20; Washington, D. C., 1974 revised

Noel P. R. B. Chesterman H. Jolly D. W. Partington H. : Thiamine (vitamin B₁) supplementation in the dog. Vet Rec 89: 260–266, 1971

Scott P. P. : Minerals and vitamins in feline nutrition in Canine and Feline Nutritional Requirements, ed. Graham-Jones ; pp. 84, Pergamon Press, Oxford, 1965