I put this sow with the boar yesterday (her litter is 9 wks old, weaned at 6 wks), and she's had a really strange turn in attitude since. She's gotten VERY aggressive. Used to be one of the most friendly, now I can't get near her w/o her trying to run me down??? She's ripping apart hog panel stapled to hardwood. I don't understand why she would just change like this overnight. Any idea's why this happens? Could it be 'heat' related? Sybil?