The paper describes the philosophy and methods of a company supplying genetic improvement to worldwide markets. The physical environment largely controls the type of sow needed, while market environment is the main influence on the type of boar. Breeding objectives have to be chosen from each of three areas: sow productivity, economy of gain, and carcass. The breeder then makes progress towards these by selection among available breeds and lines, by choice of an appropriate crossing system, and, in the longer term, by testing and selection within lines. Different production systems and carcass markets require quite different breeds and so a whole 'stable' of specialized lines is needed. While 'double-cross' hybrids ((C x D) x (A x B)) might seem optimum there are several reasons why they have not so far proved popular.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume X. Breeding programs for swine, poultry, and fish., , 130–142, 1986
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