The organisation of pig improvement is a process of continuous changes. In the beginning of this century central progeny testing was started in Denmark to improve pig breeds; the Netherlands started in 1930, Britain in 1954. These testing systems were co-operative activities, often partly financed by governmental support. Purebreeding was the common method of production with a large influence of pedigree breeders. In the nineteen sixties progeny test systems have been replaced by performance test systems, generally combined with sib testing (LINDHE et al., 1978). At the same time crossbreeding has become the common method of commercial pig production and, while the testing systems mentioned were national or regional activities, in many countries breeding companies now share the market along with organisations having roots in earlier pedigree breeding.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 5. Plenary sessions, , 609–615, 1982
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