I'm not typically a fan of government intervention in markets but Canada's marketing boards do stop this sort of concentration, so while we have higher average prices we do not get massive swings in prices, nor the physical conditions that come directly out of production consolidation that lead to events (or justifications) like avian flu at the same scale.
It's exactly the opposite as you say though, no? Canada has much more market concentration than the US, probably a major cause of the higher prices: https://alphabridge.co/economy/canadas-oligopoly-one-big-cou...