Linear Feed Formulation
Simple diets can be formulated using either Pearson’s Square or simultaneous equations methods. Both of these methods are unable to handle inequalities or ranges and both are independent of price. Conventionally “Least Cost Feed Formulation” is done using Linear Programming. This method was first developed in 1947 by G.B. Dantzig to solve some U.S. Air Force planning problems but now it is widely used in all types of fields.
For details please see this page