· The most common kind of onfarm grinding equipment is a grindermixer, which as its name indies both grinds and mixes feed in the same machine. Farmer Ed Mosbach uses a grinder mixer on his farm to mill feed for his tle and poultry. His process is to grind the corn in the grinder and then add his protein (such as soybean meal), minerals and small grains into the grinder via a side .