Actually this would be Natural Selection taking place. NOT evolution. There is NO gain in new DNA. Rather, there seems to be a loss in genetic information. Natural Selection uses info that already exists (called "culled out"). Evolution would require the addition on more DNA. What we have here is that the sheep on Ram Mt. with the larger antlers have been hunted to extinction leaving the smaller antler males to pass on their DNA.
As David catchpoole states "It seems that once the genes for large size are lost, they’re gone forever".
And he said, Lift up now thine eyes, and see, all the rams which leap upon the cattle are ringstraked, speckled, and grisled: for I have seen all that Laban doeth unto thee. Genesis 31:12
