Crossbreeding of sheep has been widely used in the United States since the beginning of the century. Gains have been made not only from the advantages of heterosis but also from a combination of meat sire breeds with ewes of fine and medium-wool breeds to produce wool from ewes and market lambs for meat with the offspring. Crossbreeding has also been used to form new breeds such as the Columbia, Targhee and Montadale. Now a new system of continuous, multibreed crosbreeding is proposed to obtain maximum gains from heterosis and at the same time to maximize the proportion of the sheep population that through crossbreeding combines optimum fertility and prolificacy with acceptable market lamb conformation.

C. E Terrill

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 1, Madrid, Spain, 765–777, 1974
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