It takes around a tonne and a half of feed per year to keep a sow (and have her rear 2 litters to weaning) and that's on top of what you'll be feeding to the weaners/growers, as Hughesy says, it's not cheap
You'd need at least an acre split into pens to provide space for her with a litter, space for growers and resting paddocks, you might also notice more damage to your ground and be into the year round pig keeping malarky - it's hard going sometimes (more so in winter
) You'll need to factor in medications, vets bills, increase in bedding used etc etc etc Not to mention the extra time (and midnight farrowings
) you'll be putting in. And don't forget to add in costs of either hiring a boar or artificial insemination too
By the time you add up all the costs you're looking at around £1000 a year to produce 2 litters (excluding your time) that's including BPA membership and pedigree costs.
But, that's all the negative stuff
Keeping & breeding pigs is the most enjoyable thing I've ever done, there's not a feeling in the world like looking down at a mum & litter snuggling in their straw and without dedicated pig nuts like us who are mad enough to take up the challenge, the native and traditional breeds in the UK might not be here in the future. Business wise, it makes no financial sense, it's probably cheaper to buy weaners to raise spring to autumn - but there are things that are more important than money IMHO.
Hope that helps a wee bit ?
Karen