I have always bought my wood shavings from TSC, the kind that says TSC too...and never had any problems. I went there and bought 8 bales of wood shavings...they no longer carry the TSC brand but now have American breeders choice wood shavings. I cleaned out my 'chicks' quarters the other day and now they are all gasping for air. One of them I have taken out b/c I seriously thought she was going to die. She seems to be breathing fine right now. Walking around eating and drinking, whereas in the coop she was just sitting there gasping. Is the American breeders wood shavings differnt in any way than the TSC kind?