I am not sure where to start, but this is our first go at meaties, and I thought we were doing ok....but..... here are the details: 7 weeks old eating a mix of game bird/chick starter crumbles (no med) 26% protien mixing with grower/cal mash 14% we are mixing the 2 grains together just to lower the protien a bit since they are huge. Symptoms are lethargy in one bird with a pale comb.... not dead yet, but very quiet but able to be with the others. Haven't seen her eat or drink. one bird we culled b/c we were afraid it was suffering. lethargic, bluish comb, barely breathing. Other 2 birds were dead as doornails when we went into feed them, and did not appear sick previously. I have noticed no blood in stools and no mold or anything like that in their grain. I am wondering if it because they are too big and ready for slaughter or if it is just random like heart attacks. My husband said the heart in the bird he culled was much larger than he would have expected it to be. (size of golfball approx) of course we only have store chicken hearts to base this on since this was the first chicken he culled and opened. Just very concerned about losing them all before slaughter day which is schedule for 2 weeks. HELP!!!!!!! Thank you!!!!