In many countries, the p ig herdbook associations produce only a minor fraction of the breeding stock used in pig industry; b r e e d i n g companies, usually founded on a m o r e or less industrial base, have "taken over" the m arket for breeding gil t s and boars. These associations often simply did not adapt from their traditional registration-oriented function to the use of scientific methods; one may ask why. As an example of a herdbook association that did adapt its orientation, the structure of the Dutch Pig Herdbook Societies will be outlined, citing from earlier work b y Knap (1988, 1 9 8 9 a b ) . We will try to clarify which organizational and technical aspects may have resulted in the fact that this Herdbook has a major share in the national b r e eding stock market (figure 1), although it has had to compete with breeding companies since 1964.
Throughout this paper, we use the t e r m "multiplier" for the produc t i o n tier where fattening piglets are produced from crossbred m u l t i p l i e r sows and terminal sires. The production of these is referred to as "subnucleus breeding".
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XV. Beef cattle, sheep and pig genetics and breeding, fibre, fur and meat quality., , 439–442, 1990
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