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. 2011 Nov 23;9(71):1287–1294. doi: 10.1098/rsif.2011.0625

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Figure 1. — Schematic of the production types with solid arrows showing the main routes of contacts. (a) The breeding pyramid is made up of nucleus herds (NH), multiplying herds (MH), piglet producers (PP) and fattening herds (FH). Animal movements occur mainly downwards in the pyramid. (b) A sow pool system consist of a sow pool centre (SPC) and several sow pool satellites (SPS). Sows are inseminated at the SPC and sows are moved to SPS for farrowing and are subsequently moved back to the centre. The sow pool system relates to the breeding pyramid such that the SPC mainly obtains gilts from an MH and piglets are moved from SPS to FH for fattening. (c) Farrow-to-finish (FF) herds have the whole chain of production integrated at the farm and hence have few contacts with other herds.