Our two first time sows, Daisy (Saddleback) and Mango (Tamworth), who both have litters approx 1 week old, are currently in our two grassy farrowing paddocks, separated by stock fencing. Both have lived together since birth and have never shown the slightest aggression to each other, any other pig, or to any of us. Two mornings ago I got up to find Daisy had got into Mango's paddock and they were fighting furiously, with lots of cuts and bloodied ears. Since then we have fortified the top and bottom of the dividing fence with barbed wire so neither can get across, but the hostility and aggression continues, with furious marching up and down the fence line, nose to nose, lots of frothing and fierce noises and barking. The piglets on either side have shown quite a lot of benign interest in each other, but are thankfully not able to get through, so there have been no incursions by piglet "foreigners" into the wrong plot. I wish they could explain in plain English what their argument is about, but we are completely baffled. This is the first time in three sets of litters, with always one sow on each side of the dividing fence, that any sort of hostility has happened. Does anyone have any ideas what the problem could be? They each have their own ark, at least 2 metres away from the fence line, and most of the time their respective piglets are inside under the creep lamp. The only thing in particular I noticed is that one of the 13 saddleback piglets squeaks a lot at feeding time, which seems to infuriate Mango who comes storming out of her ark barking loudly to look for the source of the noise. We will probably now have to add a line of electric to keep the two sows properly apart, which will undoubtedly pose further problems when the piglets get under it, or accidentally get shocked as they are still far too young for electric in my opinion. Has anyone ever experience anything like this? Tamsaddle