Abstract
Summary
A method has been described of treating cats with an estrogen plus progesterone to assure uteri in vivo highly responsive for hours to oxytocics. Modifications of this method applied to juvenile and castrated cats indicated that either type of hormone would establish some brief uterine responsiveness but that both together were required to give a maximal and prolonged sensitivity to drugs. The two hormones in the cat are synergistic, or at least mutually complementary, and not antagonistic in respect to their effects upon the sensitivity of the cat's uterus in vivo to drugs.
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