Thanks for your replies. I wasn't thinking of using a lick instead of pig food, it was more of an extra treat. Like I do with the sheep.
I just couldn't imagine them doing the 'little and often' feeding like sheep do (and what mineral
licks are designed to do) I would have thought they'd gorge on the whole lot and as was interested if other people had tried them
J xxxxxx
P.s it's the crystalyx block I was looking at - says for ruminants and pigs