Falahpour, S., Shadparvar, A.A., Ghavi Hossein Zadeh, N., Mehdi Zadeh Stalkh Kohi, M. (2013). An Optimum Regression Model to Estimate Economic Values for Milk Yield, Milk Yield Persistency and Calving Interval in Dairy Cattle. *Iranian Journal of Applied Animal Science*, 3(2), 343-350.