Can a cow digest corn

Cattle are obligate herbivores and are built to eat roughages in the form of plants, predominantly as grasses and some forbs. They do not eat meat, and if they tried it would likely make them ill.

However, the fact that meat making them ill isn't exactly truthful. Cattle that develop a condition called "pica," which is a phosphorus deficiency, will actually eat meat, even other animals that are already dead. This is because such animals are a rich source of magnesium, phosphorus, sodium and nitrogen. Cattle with pica will also eat soil, chew wood boards and fence posts, drink others' urine, all to get those nutrients that they so desperately need if they haven't received the proper nutrition.

Normal, healthy cows won't eat meat or try to eat dead animals or the parts of dead animals like the bones and that. But, if they have some sort of deficiency that leaves them eating things like soil and wood boards, they may have tried to eat some meat too in the form of a dead animal.