I've been asked to forecast what a pig farm perimeter might look like a couple of decades into the future. Starting from a a excellent suggestion by the PIC company that it should be divided into 'clean' and 'dirty' sectors, I have taken things somewhat further.
My 'dirty' sector is from 'A' on the plan to 'B', see Figure 1 below. It is where most of the coming and going takes place. On a larger farm this could take up the whole of one side rather than the 'L'-shaped layout shewn, which I guess better suits a smaller-sized unit.
Notice that the staff's feet and clothes as well as their vehicles are strictly confined to the 'clean' sector ('C' to 'B') away from the wheel and underbody contamination from all other vehicles visiting the farm.
In Britain, our Foot-and-Mouth Disease (FMD) outbreaks of several years ago taught us how vehicles visiting a farm can spread disease and that the feet of the farm staff and their vehicles wheels should never traverse the same ground as outside vehicles and people.
I suggest all producers should study the concept and not leave it 'to the future'. Anyone building anew will of course find little difficulty in following the suggestions. Even those with existing layouts should think hard about how to alter their perimeter groundplan into separate 'clean' and 'dirty' access areas, if needs be over a period of alterations.
Figure 1. A biosecure layout minimising contamination, modified from a PIC Company suggestion. Copyright by John Gadd, 2009.
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