Ground corn is the entire corn kernel, ground or chopped. Corn (also called maize) refers to the “whole” corn kernel without the husks, and is considered highly allergenic for many pets, is a cheap ingredient and it’s not recommended. Most corn is a genetically modified food, also making it undesirable. (See GM) Because corn lacks or is low in critical essential amino acids such as lysine, methionine, arginine and taurine, it is not a good source of protein. (Natura.com)