I have been asking about that one for some time. Perhaps they are not getting enough data. I have turned in numbers on my commercial Registered Angus cows for several years. They are receiving 40+ numbers from me anyway. Udder quality of a bulls daughters was a trait that was evaluated in many semen catalogs a few years back, but it seems like they have all dropped it now. Selecting a bull to produce replacements has become more difficult as a result.
When I recently asked someone at AAA when I would see an udder EPD, I was given a somewhat vague answer. "We are working on it". It makes you wonder if the numbers being turned in for some of the currently popular bulls belonging to important members of the board and other prominent seed-stock producers, are not what they want to see. I hope that is not what is holding it up, but I can't really think of another good explanation. They have released preliminary data on other proposed EPD's with less. Udder quality is more important to me than most of the other numbers. A big potential weaning weight is worthless if the calf can't latch onto a nipple and dies out on the range.
The foot EPD is a bit suspicious to me too. When the numbers first came out, there were not many good choices for improving feet. I understand many of the initial numbers were the result of independent evaluators going into large herds and turning those numbers into AAA. Now individual producers, like myself, judge the feet and turn in the data along with birth weights, weaning weights etc. All of a sudden it seems like there are hundreds of choices for bulls with fantastic feet. (According to the EPDs) I find it hard to believe the Angus breed made that kind of progress in just a few years. I suspect the numbers being turned in by mostly seed-stock producers are a bit generous. That is always the problem with traits that are being subjectively judged. Whether intentional or not, people tend to view their favorites in a better light.
