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Hams can have hay but they don't need it & giving it is a little bit problematic! You have to go through it to remove any sharp spiky bits that can damage pouches & freeze it in case of mites.

For a main food the vita garden does seem to be about the best available for diabetic prone species, your hams are hybrids btw, with a little extra protein & some safe veg, best introduced slowly until they get used to them.