If a cow goes into winter with a bcs of 6 or 7, I don't believe you'll see any negative effects from a score loss of 1 or 2 points . When we unrolled hay 2x a day , we fed only what they would clean up in an hour . I think most people overfeed, we used to and it's a difficult habit to break . As has been mentioned before , winter feed cost is one of the highest percentages , if not the highest , of our yearly cost, so trimming of the fat so to speak is not always a bad thing . Let me put my disclaimer in, I don't advocate starvation , before everyone gets out the pitchforks and torches .