Grain, including corn, barley, wheat, soybean, and rye, is an unnatural diet for cattle. Cattle have evolved to be able to efficiently digest a forage-based diet of grass and hay. When fed a grain diet, besides the benefits of increased weight gain before slaughter and boosting milk production in dairy cows, the bad often outweigh the good, as I mentioned above. When the bad outweigh the good, this means that a grain diet in cattle must be mixed with antibiotics and other additives to decrease the incidence of bloat and acidosis. When slaughtered, many animals that have undergone acidosis (acute and subacute) are found to have lesions or abcesses in their livers. Livers then have to be thrown away, as they are not suitable for food production. Trace amounts of antibiotics can also be found in meat from an animal that has been on a grain-fed diet.