Prediction of Days Open of First Three Lactation Periods from First Milk Yield, Days in Milk and Calving Age and its Effect on Improving the Economic Performance of the Herd

Reza Seyedsharifi, Ali Reza Falah Kheir and Morad-Pasha Eskandari-Nasab

Research Journal of Biological Sciences 4 ( 1 ): 59 - 63 , 2009