Three different bills have been introduced in Canada’s Parliament to end horse slaughter and the live exports of horses for slaughter.
In June 2010 MP Alex Atamanenko (NDP Agriculture Critic) tabled Bill C-544, an Act that would effectively have ended the transport of horses and horse meat for human consumption. The bill did not proceed due to a federal election being called.
Then, in October 2011, MP Atamanenko re-introduced the bill as Bill C-322. The language in Bill C-322 was reworked with Bill C-322 being withdrawn and replaced by Bill C-571.
This link explains this change.
Bill C-571 made it through to a first vote in Parliament and was well supported by both the Liberal and NDP Members of Parliament. Sadly, with the exception of two MPs, the Conservative party, who had a majority at the time, voted against the bill and it did not go forward.