Why are pigs being raised on the farm?

Pigs like to root up the pasture that cows need to graze. Pigs are not grazers like cows are, they are diggers or rooters. If pigs are allowed to destroy the pasture that the cattle are on, then there will be little to no pasture left for those cows to eat from. Besides, if the pigs aren't used to the cows and vice versa, there may be a bit of a scuffle every now and then, resulting in injury to both parties.