from the information I have seen on the internet through many differant sources I have found, chickens know for the most part what they can eat and not hurt them, and what not to eat. Even though chickens do not have the same taste buds that heat up when something spicy is eaten, they can tell if something is harmful and will not eat it. I have not looked into that type of pepper yet, but common pepper types I keep seeing are red pepper, and cyan pepper. I have no idea what jalapeno pepper would do. But it is something for me to look into.