As long as it is permitted to eat [chametz], one may feed [it] to livestock, beasts, and birds, and sell it to a Gentile, and [deriving] benefit from it is permitted. When its period has passed, [deriving] benefit from it is forbidden, and one may not fire an oven or a range with it.  R' Yehudah says: There is no removal of chametz except by burning. But the Sages say: He may also crumble [it] and throw [it] to the wind or cast [it] into the sea.