After evaluating when each cow calved last year, cows that are not predicted to meet those dates are sorted for one of the good cow sales coming up. There is nothing wrong with the cows, they just aren't calving when the research center needs them to calve. Sell those late- calving cows below that line. Personally, I don't ever have a problem getting rid of cows that don't calve when they should. No one has all spring to calve and a good goal is to have 90 percent of your cows calved in 45 days.
Calves are variable enough in the fall without having excessively long calving seasons.
Now is a good time to add up how many cows are left, and how many more you would like to sell. The length of winter feeding always is determined by when winter starts, not when it ends. Look over at the feed pile and mentally ponder just how long this winter will be. If not, you may want to take another look at those cows 10 years or older and cull some more of the thinner ones. These are the cows that weaned lighter calves based on 205-day adjusted weaning weights.