Minimum Maximum Adjusted Weaning Weight, lb. 0.01 0.62 Fat Thickness EPD, in. 93 Adjusted Ribeye Area, sq. 9,239 10.9 2.2 5.4 16.7 Ribeye Area EPD, sq. Carcass data is really no different than birth weight, weaning weight or yearling weight.
Environmental conditions play a large role in the value of a trait.
Under very good feed and weather conditions a calf might wean at 600 pounds, but raise that same calf under poor feed and weather conditions he might wean at 400 pounds. The genetics for the calf are exactly the same, but the environment he was raised in is different. The same applies to carcass ultrasound measurements. Feed and other environmental factors play a large role in the level of these traits. Looking at ribeye area per hundredweight is a good way to account for an animals overall size in relation to it's muscling, but ribeye area per hundredweight is not a very good value to select upon.