I'll assume for the moment this is genuine, you must remove the male into a separate cage now, males can live very happily on their own. I am shocked that a presumed animal lover is prepared not only to put the females through a state of almost continuous pregnancy but also happy to kill 20-30 innocent babies once a month. Perhaps it would be better for all concerned if you rehome these poor animals and next time you are tempted to have a pet you do some research first. If this s just a wind up then I would recommend getting out more and growing up a bit.