[cypher]

I know it's difficult when you can't get good mixes but you do need to be careful if you're mixing things up yourself as you can't know with out doing quite a bit of research & calculations what nutrients they are getting, they probably won't be getting a balanced diet & may have deficiencies. It maybe be better to give the commercial mix then just top up protein if needed & give a good variety of fresh veg, a lot of hams aren't keen on celery tbh, try more green leafy veg & broccoli.
If he's underweight & not eating well you could also give a little porridge, just some rolled oats cooked in water & cooled.