Important - we don't eat cows. We eat steer. Cows have been bred over the decades and centuries to give birth and milk, not to yield meat. That's important, because some cows are heavier than their steer counterparts (Holsteins, for example).
Also very dangerous is inducing a miscarriage by taking strong medications prescribed for other ailments and many of the ways to induce a miscarriage can actually end in loss of life or other very serious consequences.
3. Cinnamon. The third answer to how to cause a miscarriage is cinnamon. Cinnamon is a naturally occurring abortifacient (a substance that causes miscarriage). When taken in the correct dosage, it causes uterine stimulation.