i did a search on wood pellets.. the kind for wood stoves and they are supposed to be organic and made of hardwood.. we had several bags get wet from the snow last year so we tilled them into the garden.. we had stringbeans about 4" tall and completely yellow.. nothing else came and gave us any veggies.. the garden is huge.. was a strange year but we are thinking maybe all those bags of pellets did something.. i wouldn't use them in with your chickens..i thought they were shaped from pressure but maybe something is added to keep their shape? they sure killed the garden thats for sure..