PIP: Means of contraception and abortion in cattle are discussed. Estrog en injections (diethylstilbestrol or estradiol benzoate) may be given within a few days of conception, as may oxytocin and prostaglandins. Infusion of a sterile solution into the uterus is another means of inducing abortion. Intrarectal applications of estrogens can also be used to suppress the corpus luteum. Later in pregnancy, injury to the fetus or the membranes, or surgical removal of the fetus are possible. Estrogen or corticosteroid treatment may also be used to induce labor. Because the sperm must be immobilized before they reach the tubes, contraception is difficult to carry out in practice.