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Researchers reasoned these snow monkeys could model mood changes due to ovariectomy without confounding variables like the social stigma of barrenness that might affect women.

At the Ohio State Fair grounds there were expert demonstrations of tonsillectomy, caesarian section, amputation of the breast and painless killing of dogs; castration of aged boars; operation for umbilical hernia and rectal prolapse in swine; ovariectomy and dehorning of cattle; artificial insemination of mares.