An interactive multigoal programming model for determining livestock rations: An application to dairy cows in Andalusia, Spain

The paper addresses an important problem in the field of livestock ration formulation: the rigidity of the right-hand sides of the model. Thus, instead of considering the nutritional requirements as fixed values they are considered as targets which may or may not be achieved. In this way a multigoal programming model is formulated. The preferences of the ration-formulator are elicited resorting to the interactive method proposed by Zionts and Wallenius. The approach proposed is applied to a ration formulation problem for dairy cows in the Pedroches Valley in Andalusia, Spain.