Are the pigs going to have access to pasture? Will they get to forage for some of their own food?
I raised my pigs last year on only forage and wheat/barley which was soaked for 3 days in
water with
apple cider vinegar.
I would add some kelp meal to the food.
Plus they got all of the kitchen scraps.
I also got deliveries of food from a
local restaurant.
Pigs grew fine!
The kelp has salt in it. I did not add any salt to the food.
For a while i was giving them 12% rabbit pellets.
In the fall they received all the apples i could give them.
Honestly the pigs got every possible food i could give them. I gave them
chicken eggs along with their shells. Some times i gave them just egg shells with their food.
Ask a local cheese making place for some spent
dairy or whey.
Ask whatever food place for spent produce.
consider all options!