Regardless of where the hay is grown in Canada, it's relatively easily to ship feed into the US. However, regardless of where the feed originates in the US, it's difficult to bring it into Canada. This is true even of Canadian hay rejected by a buyer. The latter may have rejected the hay because of its colour and the Canadian seller is forced to accept a price that may be 40, 50 or even 70% lower because he cannot bring the shipment back to Canada. Once the hay has crossed the border, it becomes American hay, so to speak, and the CFIA requires a phytosanitary certificate before the hay can be brought back to Canada, even if it was originally grown in Canada.
Can you explain this policy to me?