Guernsey cattle, breed of dairy cattle developed on the islands of Alderney, Guernsey, and Sark near the north coast of France. First imported to the United States in about 1830, they are fawn-colored with white markings and are of medium size. Their milk is golden in color and rich in vitamin A. The average milk yield is a little higher than that of the Jersey, but the butterfat content is slightly lower.
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