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A Sexual Dimorphism in Three Somatic Tissues of Cattle

Department of Animal Husbandry, Cornell University, Ithaca, New York

ABSTRACT

A method of illustrating a sexual dimorphism in three somatic tissues of cattle has been perfected. A small, mildly chromotropic, planoconvex chromatin mass found predominantly in females was interpreted to be the sex chromatin reported present in many other mammalian species. In liver, pancreas, and adrenal the sex chromatin appeared in 68, 62, and 61%, respectively, of the cells examined, but in only 10% or less of the male cells. The possible uses of sexual dimorphism at the cellular level in elucidating embryonal development, and its proposed use as a method of antenatal sex determination in veterinary practice, were considered. Unknown tissues were properly classified as to sex in 19 of 20 cases.