As more results comparing different breeds are published, more crossbreds studied .and new breeds developed, the literature on sheep breeds and strains has become enormous and beyond the bounds of any meaningful detailed review. The situation is somewhat in contrast to other farm livestock, especially pigs where fewer breeds are now involved due to increasing standardisation, intensification and specialisation of the pig industry (Sellier, 1976). This contrast is hardly surprising in that sheep provide fibre, meat, milk, skins and dung for fertilisers or fuel over a wide diversity of production systems throughout the world. These range from nomadic and transhumance systems of Europe and tethered systems for utilisation of crop wastes in Asia and Oceania, to Highly intensive grassland farming and production from stall-fed and housed animals (Rae, 1952; Sierra, 1974; Taneja, 1974; Treacher, 1974; Devendra, 1979; Turner, 1980),

J. N Clarke

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 5. Plenary sessions, , 635–654, 1982
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