The Incidence of Spontaneous Tumors in Female Mice (Breeders) of the CBA Strain

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Abstract
The incidence of spontaneous tumors in female mice (breeders) of the CBA strain has been indicated in three recent papers (1–3). The purpose of dividing the observations into a series of individual experiments has been to eliminate any possible genetic variability as a source of varying tumor incidence. So far, two series (1, 2) of mice have been used for a moderate degree of breeding and then placed in reserve on a “mixed oatmeal diet”; a third series (3) of 63 females was similarly treated but continued throughout life on a commercially prepared diet.