1. Most dairy herds today are of Friesian or Holstein breeds.

2. Many farmers are grading up their Friesians over four generations to register as Holsteins.

3. However, it has been replaced by Friesians for milk and is now bred more for beef.

4. It had Breton blood but, like the Breton, was heavily crossed with the Friesian and became extinct by the 1960s.

5. Today it is often a top-cross sire in dairy and suckler herds, especially to Friesians and Holsteins.

6. According to DA genetic distance to forecast the heterosis, East Friesian, South African Mutton Merino, Dorper and Small Tail Han sheep will have the largest heterosis.