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".

P. W Knap

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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