Pot barley?

[gprescueirleland]

I am fostering 6 of the most angelic little guinea pig girls at the moment all in great health etc the previous owner was feeding them the usual foods but also gave them pot barley, no idea what it is and don't intend feeding it but can anyone tell me if this was an ok food to feed?

I'll post pics soon, they are so cute you'll squish the screen ;D