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Holstein Association USA, The World's Largest Dairy Cattle Breed ...
Holstein Friesian - Wikipedia
Holstein | The Cattle Site
Holstein Cattle Breed: Facts, Uses, Origins & Characteristics
History of the Holstein Breed
Holstein 101
Holstein-Friesian | Dairy Cattle, Milk Production & Breeding
Holstein Cow Facts | American Dairy Association North East
Holstein Cattle Breed – Everything You Need to Know
History of dairy cow breeds: Holstein - MSU Extension