The North American Mule Sheep Society (NAMSS) is an organization formed for the
education, promotion & marketing of the
breeds of sheep that comprise the crossbred breeding scheme, commonly referred to in the UK as the
"Stratifed 3-tier Breeding System".
3-tier breeding scheme utilizes traditional British Hill & Upland ewes from breeds such as the Scottish Blackface,
North Country & Border Cheviots, Clun Forest, and Shetland sheep. These hardy and adaptable ewes are bred to
a Bluefaced Leicester tup to produce the popular and prolific commercial ewe called the 'Mule'.
The final tier of
the scheme is to utilize the heavy carcass genetics of terminal rams, the British type Texel and Suffolk, to economically and
efficiently produce wholesome, healthy, grass fed lamb.