THE ORIGIN OF THE PHEROMONES CAUSING PREGNANCY BLOCK IN MICE

Abstract

In contrast norma] and spayed CBA females, spayed and androgenized CBA females are as effective as normal CBA males in blocking ovo-implantation in newly mated P mice. Hence it is concluded that the pheromones involved in producing the block to ovo-implantation are associated with androgens either directly, Or indirectly through some androgen-depen-dent gland.