The reference parameters for 10- and 19-week old CFY (remote Sprague-Dawley) rats fed powdered feed have been studied: growth curves, food consumption, ophthalmoscopy, results of urinalyses and hematological and biochemical assays, and absolute and relative organ weights. Detailed information is given of instrumentation and methods employed, of the animals, strain and environment, and of blood-sampling technique. In general, the results obtained were similar to those previously reported in literature.