Many people like to use pig feeds as a feed for rats, and since I know my pigs and pig feed I am going to inform you on what to use.

What not to buy-

Purina pottbellie pig food

Medicated feed because you don't want livestock wormer in your little rats! LOL

Starter feeds made to grow young pigs it will make your rats fat!
and they normaly have meds

Whaat to buy

Showtec feeds
or
moormans feeds moormans is the best pig feed period. There starter feed is medicated so its a nono. At 17 bucks for 50lbs it will last you a life time!

Hope it helps!