roughage

The greens cut through the richness of everything else that was being served, providing some much-needed roughage and, amazingly, letting everyone eat more than if their stomachs had been full of only animal fat and cheese.

Also they gave us roughage fur our hosses and wouldn't take pay fur none of it, indicatin' by signs that it was all a free gift.

I keep an abundance of roughage, usually shredded corn, before the cows all the time.

Bean straw is sometimes given as part of the roughage in Scotland, but not in England.