If you do decide to go for an arc - buy the biggest you can afford

8 x 10 will happily accomodate a sow and litter or up to about 10-12 weaners to pork size.
When using it with less pigs just block some of it off with bales

Always better to go for one with a floor too if you can - enables year round pig keeping in comfort (for the pigs

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Ooooo exciting for you ! Can't wait to see the photos
