I don't know, but I guess that would explain how I saw them sell. For instance, they would run say 20 steers in. Maybe 12 would be angus or black baldy,,, with a few Charolais, red baldies, herefords, etc. in the mix. The display would show 20 head. Average 600 lbs, total weight 12,000. Auctioneer would say : " Selling the 12 black ones". They'd auction them off , and thjey;d bring , say, $1.85. Without them leaving the ring, he'd say " Selling those 2 white steers". The display would change to 2 head, average weight might change to 650, and the total weight would change to 1950. Theyd do the same thing with the red ones, etc. None of the cows left the ring, so they had to have been weighed when they got there.
Today the place to sell is Missouri. TN, NC and KY sales are running close. Going west, OK sale they are bringing decent, not like MO but as good as the other SE sales. Midwest, especially upper midwest, would be the pace to buy today.