iran is located in arid and semiarid areas based on continental divisions; any change in precipitation would have potential effects on agriculture, economic and other related issues in general. therefore, it is of high importance to know and identify the moisture-related sources needed to study the country’s precipitation data. for this purpose, it is important to correlate monthly precipitatio...

Monthly averages of Holstein service sire PD from January 1960 through December 1985 were examined to determine if a relationship existed with changes in evaluation methodology. Monthly average of service sue PD for registered cows from January 1971 through December 1985 suggested three linear periods of increase. Regression of PD on sequential month were significantly different for periods def...