It has been hot here in NH. Feed the broilers Saturday night. All were well Sunday morning. Came home and 30 out of 38 were bed. Not a mark on them. Laying together. Lost another on today. They have plenty of shade. One added point was when it was really hot Thursday, one of them was wheezy but fine next day. I am so heartbroken. Now worried about my layer who have no contact with broilers and show pen too. I am 100% sure no animal got in there. Should I give the others some VetRx in water. Does anyone have any ideas???