The Jersey line has been developed as the Jersey is a more heat tolerant base than the Holstein. The Jersey bloodline feeds the Hojo and NZ Cross Breed lines, adding significant hybrid vigour.

Further development of the Jersey line has utilized several more NZ herds to provide the genetic platform, and has created more options for farmers. Some of the bull team has reduced residual Senepol for more moderate climates, other options have increased US Jersey for the liquid milk markets, and increasing the NZ genetic influence for heat stressed free range pasture-based systems.