They are all dairy breeds.
Holstein Friesian cattle
I am pretty sure the black horse is a Friesian. There are a few other breeds it could have been, like a fell or dales pony, but it is most likely a Friesian.
I don't know all of them but I know that the Friesian did.
The Friesian originates from Friseland, located in the Netherlands :)
The genes.
Holstein-friesian, Brown swiss
The Friesian horse originates from the province of Friesland and the Frisian islands in the north of the Netherlands. It was thought to have been originally bred by farmers, but later went on to become a widespread and popular medieval warhorse, nobleman's mount, trotting horse, and carriage horse, influencing many of the modern European breeds.
The best way to get a good Friesian Crosses is having appropriate breeds.
They came from Friesland, which is part of the Netherlands.
One can find a list of horse breeds on Wikipedia. The main horse breeds are Barb horse, Abtenauer, Abyssinian horse, Akhal-Teke, American-Indian horse, Friesian horse and Irish Draught.
Icelandic.