All the males received sexual conditioning, which consisted of 30-minute copulatory trials every 4 days with ovariectomized ... caretaker reported that one rat had a slight enlargement of the ...

The rat tail contains a dorsal vein ... of stress and Nembutal on plasma levels of gonadotropins and prolactin in ovariectomized rats. Endocrinology 90(3), 707–715 (1972).