That is very unusual but unfortunate for Who to throw one quiet so large. Although, I have a freind that every year his Who calves are the largest and the growthest of his group. So, you know something in the Who Made Who bloodlines are clicking with your gals bloodlines to produce big birth weights. I would steer clear of any Who blood. I would try the angus option or calving ease option like Ali or another bull. But it can be bad luck or genetics. If she has another monster on the second calf with a calving ease bull that may be her birthweights. Stinks to loose one. Better luck next go around.