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abdominal abnormal active altered amount animals anteflexion appearance become canal cause of sterility cells cent cervical secretion cervix changes Chapter clinical coitus complete condition corpus corpus luteum course curetage cyst decrease deep urethra degree diagnosis diet disease dition ejaculation epididymis especially essential estrous cycle evidence examination fact failures female fetus fibroids follicle frequently function genital glands gonorrhea gonorrheal habits human race important impregnation incision increased individual infection infertility insufflation less ligaments male marriages mating mature mechanism of fertility menstruation ment method microscopic mild miscarriage motility mucous membrane mucus necessary normal obtained occur operation organs ovarian ovarian neoplasms ovary ovum partner patient pelvic persistent physiology possible postcoital pregnancy present probably produced prognosis pronucleus prostate puberty rarely rats result semen seminal vesicles sexual slight spermatozoa stage sterile marriages sterility sufficient surgery suture symptoms testicle tion tissue treatment trouble tubes usually uterine cavity uterus vaginal varies vitamin woman women