Some Bradford County, Pennsylvania residents now have first-hand round-up experience after a tractor trailer full of swine tipped over in a ditch.  State police say the driver moved to the far right of East Canton Road in Granville township as he approached a downhill grade.  The authorities say the driver was trying to avoid a possible hazard from on-coming vehicles.  The truck went onto the shoulder where it encountered soft dirt and rolled, releasing the cargo of pigs.  Farmers and residents helped authorities in corralling the swine and removing them from the scene.