Group size has recently gained more attention with the difficulties producers are facing with the PMWS/PDNS syndrome. Performance and economic implications all play a part in determining the 'ideal' group size for each farm, but it seems that groups of 20, kept intact after weaning, are the optimum. Here is some of the evidence, supported by our own work at Green Hill Farm.
This article can also be found at Pig Progress, volume 17, no. 10
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