Two research trials are under way. The project nearest to completion is being conducted at the University of Minnesota in research herds where half of foundation Holstein cows were bred to Jersey bulls, while the other half were bred to Holstein sires. Results from 77 crosses and 72 purebred Holsteins showed no significant difference in fat or fat plus protein yield, but Holsteins were higher for milk yield (7266 vs. 6693 kg in 305d). Days open were lower in crosses (139 vs. 155d).
Another study at Virginia Tech and the University of Kentucky is still in more preliminary stages, but initial comparisons of yields show no significant difference for production of fat and protein from purebred Holsteins or crossbreds. Both Holsteins and crossbreds outproduce purebred Jerseys significantly for milk, fat, and protein. Data on fertility and survival are not yet available. Generally, crosses of Holsteins and Jerseys look promising, especially in manufacturing milk markets where protein premiums are paid and possibly under grazing conditions where a more moderate-sized cow could be desirable. Contact Dr. Les Hansen at Minnesota, Dr. Bennet Cassell at Virginia Tech, or Dr. Jack McAllister at Kentucky for the latest results.
