- Fuzzy logic was employed for timing the transfer of dairy cows from a high-energy to a lower energy ration. The transfer decision is based on trends in milk production, body weight change, and the interactions between them. To express these trends, eight fuzzy sets, with corresponding fuzzy variables, were defined by the domain expert on the basis of empirical data obtained from hundreds of individual cow records. Ten rules were defined, incorporating different combinations of the the fuzzy set variables. Operators were defined to combine fuzzy variables into rules and rules into a decision.