Belgian farmers have dumped three million litres (660,000 gallons) of fresh milk back onto their fields to try to demonstrate that they cannot make a profit as milk prices collapse.
Prices are down 40% since the spring, one lobby group says, putting unbearable pressure on farmers and forcing some out of business.
Many farmers are angry over plans to increase EU milk production quotas - which keep the price of milk artificially high - by 1% a year, and eventually to scrap them altogether.
Some EU member states back the farmers, but the European Commission is determined to reform the dairy industry and the Common Agricultural Policy, which soaks up more than 40bn euros (£35bn) a year.
The European Commission argues that while the changes may be painful in the short term, a more flexible market for dairy produce will help farmers prosper in the future.
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