http://www.nature.com/news/pig-manure-fertilizer-linked-to-human-mrsa-infections-1.13752
http://www.extension.purdue.edu/extmedia/id/ID-205.html
Looks like if it is properly composted it's great,IF not it can cause a world of hurt.
Too many other sources of manure-especially Alfalfa raised critters that are better poopers to use for ferts.
I worked at several resort kitchens that sold the pot washers trash to pig farmers.
Everything we washed/scraped off plates and pans went into a trash can of grease etc.
Nasty stuff.
It set out on the loading dock until enough cans were there for the buyer to come pick up.
THEN it was REALLY nasty stuff.
Picture 35 gal.trash cans full of grease and EVERYTHING else from a restaurant all fermenting for a week,then fed to your Bacon on the hoof...
When the tank truck came by it sucked it all up,along with thousands of Gal. of similar stuff from other places.
Our place only was about 400-500gal. a week minimum.
The truck held several thousand gal. of slop.
Making you hungry yet? LOL
All the pig farmers said they did was screen (run it through a wire mesh) the stuff,plastic spoons,glass etc. messed up their pigs.
Yum Yum...
IF the manure is from the pigs raised indoors it's even worse.
Tons of pigs on cement floors with drains.
The floor is flooded every so often to wash the crap away.
Real nasty stuff.
I'd guess a small time farmer/rancher with outdoor pens would be different.
I don't know.
Might depend on your pig poop source.
Seems there are safer ferts to get for cheap.
Horse boarders etc. love it when you haul away bandini mountain for free.
Big places sell it,small places don't produce enough to interest buyers.
The boarders stuff has alfalfa etc. in it=good stuff.
You have to compost it sometimes if the place is really small,but it's free.
As posted above,look for mushroom growers and such too.
Rabbit crap is really good once composted...