The newest genetic measurement is DPR or Daughter Pregnancy Rate.   It is calculated by measure of the calving intervals after a cow has her second (and later) calvings.   Keep in mind the USDA data set only uses the first five lactations, so there would only be three "calving intervals" measured, and most weight will be on that interval between second and first lactation, with a default value of 250 days open assigned a cow who is culled in lactation.   (At 2.4 lactations per cow national average, only half of DHIA cows would have two measured and then a third default value calving interval.    The other half would have only one measured calving interval at best). 

The Jersey breed is currently on a roll.   More people want Jerseys than presently have them.   More Jersey semen and Jersey bulls are being used for dairy crossbreeding than ever before.   Many leaders in the developing seasonal grazing movement promoted the superiority of Jerseys in grass environments.   Nations that never had Jersey cattle are starting to bring them in; nations that wrote Jerseys off a couple decades ago have returned to them.

Mama is my Breeder's favorite cow;
She gets to stand in the very first stall.

She fills that pail with creamy milk

and catches your eye the way she's built.