I'll second the "start small" and grow slowly. Raise a few feeder weaner pigs for several years over the easy summer months to get your feet wet and find out if you like raising pigs and if you're good at it. This will give you a chance to setup infrastructure, learn the ropes and figure out your costs.
You will not likely make any money selling as commodities, to the local butcher or at auction.
You aren't likely to make much money with only 40 pigs. That's very small, too small to keep a steady supply to regular customers which is what it takes to earn much on pigs, or most anything. To make money it really helps to have regular repeat customers.
Producing the pigs is only part of the game. You need to sell them for enough above your cost to make a good profit so you can buy your next round of pigs, improve your facilities, pay yourself, your mortgage, your taxes and put away some for savings. Do a business plan before you invest in this. There are a lot of costs which people tend to miss. Add a healthy margin of error in addition to your own profit because it will cost more than you think. Check out what other people are selling for locally and then you can get an idea of if it is remotely possible to break even or come out ahead.
Do not try to compete with the CAFO's on price. They have their own processing, are buying feed in volume and deal in such volume that you'll never beat them. Instead focus on producing a premium product and selling directly. Stores and restaurants are looking for a steady supply of pork. They're not that interested in the occasional pig. Getting to that level takes years as you must develop not just the raising of the pigs but the marketing of the pork and weaner piglets if you sell those too.
One problem you'll hit is that if you have 40 pigs growing up as a cohort then you're going to have 40 ready for slaughter all at once which saturates your market and then you have nothing for the rest of the next six months. This hurts direct sales which is where the money is. This is why we stagger our pigs to slaughter each week.
We raise pigs on pasture for a living. We have no off farm jobs. This is what we do. We have about 400 pigs and that does yield a living. We do live very frugally. Don't expect to get rich quick. But we never starve as we always have food and that is a good thing. Our niche is delivering fresh pastured all naturally raised pork on a weekly basis to local stores, restaurants and individuals. We grew into this over a decade - it doesn't happen over night. Starting a new business typically takes a year or more before you get to profitability. Farming generally is on the longer end of that.
Once you get going you'll find that there are three production costs that make up the majority of your expenses:
1. Piglets - Figure about $50 to $200 depending on the quality and breed. Quality does make a big difference as better pigs will pasture more and grow faster reducing feed costs and time to market. This is why people pay for quality genetics over the auction house or factory culls. Auctions are the best place to pay the lowest price and get the lowest quality. Likewise they're the best place to get the lowest price when selling.
2. Feed - pigs eat about 800 lbs of feed to get to market if you're feeding commercial hog feed. Prices vary so check your local supply and buy in bulk. Figure on $240 to $650 depending on the quality and quantity of feed. Organic is very expensive. Look at how you can supplement or replace the expensive feed with things like pasture, vegetables and fruit you grow, food excesses, etc.
3. Processing - If you're selling direct then you'll probably be dealing with processing and it is a huge cost. Including transport its about $200 to $260 a pig depending on how much secondary processing is done for sausage, smoked hams, bacon, etc. Processing cost us 64% of every pig last year. This is why we're building our own on-farm USDA inspected meat processing facility.
All the other costs put together for infrastructure such as fencing and other things makes up a very distant 4th cost. The three above make up about 90% of the costs and each is about 1/3rd of the total costs of raising the pig. Getting each of these under control is what making money at farming is about. The more you do yourself, the more money stays in your pocket.
This does not include the startup cost of debt. Debt is a tool, use it wisely and watch out for it sucking up all your income.
You might find this article interesting:
http://sugarmtnfarm.com/2005/08/31/k...-pig-for-meat/
Cheers,
-Walter Jeffries
Sugar Mountain Farm
Pastured Pigs, Sheep & Kids
in the mountains of Vermont
http://SugarMtnFarm.com/