yes you can introduce a young boar with him but you do have to follow a few basic rules like being watchful for trouble, the older one will most likely want to be boss pig and start to show his dominance as long as the baby or younger one accepts this then all should be well, if any real bad fights occur remove him and start again it might work it might not,give them plenty of free room maybe on the floor with you watching them indoors and make sure their home is spacious and has 2 of everything and places to hide mine like pipes and igloos, with a little patience it can and does work, as already said anymore info can be got on barmy4boars website or more will post later with tips and ideas good luck, dont leave one on its own even if it does'nt work put them side by side