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Holstein Friesian - Wikipedia
Holstein Cattle Breed: Facts, Uses, Origins & Characteristics
Holstein - The Cattle Site
Dairy Cattle, Milk Production & Breeding - Britannica
History of dairy cow breeds: Holstein - MSU Extension
Holstein 101
Holstein Cattle Breed – Everything You Need to Know
History of the Holstein Breed
Holstein Cows – Breed Profile, Facts and Care - AgronoMag
Holstein Cattle Breed Spotlight