What happened is that as a result of international trade negotiations at the WTO, Canada made spent fowl part of its schedule to the WTO. So it has formed part of our domestic law. It's there. It exists.
Evidence of meeting #28 for International Trade in the 42nd Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was fowl.
A recording is available from Parliament.