Pierre Poilievre’s 25-point lead in the polls evaporated, and he struggled to switch voters’ focus to the economy, crime and other issues.

This is because dairy supply in Canada is controlled through milk quotas, with commercial farms required to purchase quotas in order to be in business. Quota sales are negotiated in terms of daily kilograms of butterfat produced rather than litres of milk and can cost upward of $30,000 per cow, or around $3m for a 100-head herd.

Canada officials say they're ready to negotiate tariffs if Donald Trump is willing to come to the table. Advertisement