True protein is a more accurate indicator of the actual amount of protein in milk.
The USA is among the world leaders in adopting its use in milk recording and genetic evaluations. In August, USDA will update the reference point, or base, used for expressing genetic evaluations. An update of the genetic base is necessary so that PTA values provide a practical indication of potential genetic improvement. The genetic ability of dairy cattle has improved, and the PTA s for the best animals have increased dramatically. A new reference point needs to be established periodically so the PTA values remain functional for breeding decisions.