[2]: 587  In 1934 twenty-four of these pigs were imported from Denmark by the United States Department of Agriculture for cross-breeding and research purposes, with a condition that they not be used to create a purebred commercial stock.

The new breed was founded on stock that was either purebred Danish or had a small percentage of Poland China blood.

To reduce inbreeding, thirty-eight pigs of Danish, Swedish and Norwegian Landrace descent were imported in 1954 from Norway.

The head is long and narrow, the ears are large and heavy and hang forward close to the snout.

[3]: 405  The sows produce plenty of milk, the lactation peaking at five weeks, which is rather later than is the case in most breeds.