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.
Whatever the case, it's better to know how to cause a miscarriage with safe natural methods. In fact, many of these methods have been passed down for generations. Abortions are mostly conducted during the first trimester, and the earlier you do it, the better.