on day 7 ( day 1 = insemination ) , the number of conceptuses was reduced to one by aspirating all but one conceptus ( the aspiration group ) , by removing all of of the uterus except that containing a single conceptus ( the hysterectomy group ) , or by aspirating conceptuses , as in the aspiration group , plus ligating the uterus , as in the hysterectomy group , but without removing the uterus ( the sham hysterectomy group ) .
C0042149
uterus
C0020699
hysterectomy