From BiblePortal Wikipedia
Webster's Dictionary 
(n.) One of a breed of cattle, originally from Schleswig-Holstein, valued for the large amount of milk produced by the cows. The color is usually black and white in irregular patches.
The Nuttall Encyclopedia 
Which with Sleswick forms the Prussian province of Sleswick-Holstein ( q. v .), was till 1866 a duchy of Denmark, but in that year was annexed by Prussia.