<P> Beginning in 1912 in Laramie , Wyoming , Lincoln rams were crossed with Rambouillet ewes . In 1918 , the foundation flock was moved to the U.S. Sheep Experiment Station near Dubois , Idaho , for further refinement . Today 's Columbia is a popular breed , with heavy , white fleeces and good growth characteristics . It is one of the larger breeds , and is often used for cross breeding in commercial western flocks . </P>
what are the two breeds which were crossed to make the columbia
Lincoln rams Rambouillet ewes