(most common name)
RX3 cattle were developed in Iowa and registered in 1974. They are 1/2 Red Angus, 1/4 Hereford and 1/4 Red Holstein.
You can also go to:
My Daily Cow® USA and read about other American cattle breeds.
The Cow Wall® A-Z Cattle Breed Picture Reference to see other breeds of cattle in the world.