The most important factor affecting the efficiency of meat production by sheep populations is the reproductive rate. This is so because the litter size (fecundity) of the most important meat producing breeds is well below 2.0. There is, therefore, considerable interest in methods of achieving genetic improvement in litter size. While recently many investigations have been initiated into the use of highly prolific breeds (e. g. Finnish Landrace) as a source of genetic material for the improvement of fertility there is still a role for prolific strains of native breeds if they can be developed.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 3, Madrid, Spain, 1033–1038, 1974
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