When they're growing (from weaning to pork weight) the two 'rules of thumb' are usually
1) 1lb of pig nuts per month of age up to a maximum of 6lbs (or slightly less depending on the breed)
2) As much as they can eat in 15-20 minutes.
If you want to replace some of their rations with fruit and veg you can - build it up gradually though

1lb of pig nuts is equivalent to 4lbs of fruit & veg and you shouldn't give them less than 50% pig nuts in their daily ration.
Kunekunes are completely different though, so if you change to them at some point in the future - feed MUCH less

HTH
Karen
