From their website:
Nutrius LLC is a leading manufacturer of vitamin/mineral supplements and premixes for livestock, poultry and companion animals. There is no other West Coast supplement company that works as well with customers and nutritionists.
Operating out of Kingsburg, California, Nutrius’ dairy supplements group serves more dairy cows directly than any other single plant operation in the world. Nutrius markets a comprehensive product line of supplements and specialty feed ingredients for the entire growth/production cycle of dairy cattle.