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), pp. 343-350. doi: