Nearly all of the domestic animal stocks in Canada and the United States have been introduced from the Old World during the past 400 years. Historically, the introductions occurred in several distinct waves of importation. Some descendants of these importations have retained their identity, and now represent isolated sub-populations of the parental stocks in other lands. Except with poultry, animal breeders have made relatively little effort to establish new and distinctive breeds in North America, preferring instead to retain the characteristics of the ancestral stocks.

R. D Crawford

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 6. Round tables, , 107–116, 1982
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