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Effect of bromocriptine on the ovarian cycle of two inbred strains of mice

Mice of the C3H/Sy (high incidence of spontaneous mammary cancer) and AKR/Sy (low incidence of spontaneous mammary cancer) inbred strains, which have different hormonal profiles, were injected daily with bromocriptine for 1 month. The treatment increased the duration of the ovarian cycle of the AKR/Sy mice, whereas that of the C3H/Sy mice was not affected. It is suggested that the effect of bromocriptine on the ovarian cycle depends on the concentrations of plasma progesterone reached in each strain of mouse.