[Ultrastructural changes in the mammary gland of the lactating rat induced by treatment with bromocriptine].

The authors report the results of their ultrastructural study on the lactating mammary gland of the rat treated with bromocriptine. On the sixth day of treatment the mammary gland shows the same morphological features of the physiologically involuting mammary gland and the same morphological features of the mammary gland of the rat whose pups have been taken away. These results suggest that the pharmacologic treatment with bromocriptine induces a physiological involution of the lactating mammary gland in the rat and that the same drug abates the effect of the persisting suckling stimulus.