Thank you for the replies, I suspected there might have been a problem between camelids and pigs otherwise more people would be keeping them. I farrow 35 - 40 sows every three weeks in a paddock with an 8 strand electric "fox fence" the last problem fox was jumping over, the game keepers next door shot three foxes and the problems stopped, now the sows are again being aggressive and there have been prints form a younger fox in the paddocks, but no piglets missing as yet this time. There is enough grass in the paddock but outside of the farrowing pens to support several sheep, or a llama, and we would supply hay and nuts as required.