From 2000 to 2010 when ranking the Irish dairy herd on EBI, cows with Jersey crossbred genes had a €100 higher EBI when compared to the other breeds.

This tells us that the average Jersey-crossbred cow was predicted to be €100 more profitable per lactation in comparison with the black-and-white breeds. This is before hybrid vigour, which is estimated to be worth another €100 in extra profit, is considered.