firstly fabulous that you are keeping and breeding this wonderful breed of pigs 🙂
whereabouts in the country are you ? I may be able to source a suitable boar for your sows . The checkmate tool on the BPA website is easy to use to check compatability when you have found one. Another option is AI , and there is a brilliant article in the March edition of spot press that is due next week , that will give you all the information you need on this method of breeding.
Good luck with your search and if I can help please let me know