Farmers facing rocketing costs for producing milk, cheese and other dairy products under a phased removal of European Union quotas that artificially propped up prices, have been on strike for 11 days in France.
At the same time, milk prices in some countries have more than halved since 2007, according to Schaber, whose organisation represents a third of European milk producers.
Reports of suicides by three farmers in France over the past week lay behind a call for a "minute's silence" in the southwest of the country on Tuesday, while protests were also held in Switzerland and the Netherlands, where half a million litres were poured away in one field.
Italian farmers also halted deliveries to industry and announced a blockade of routes through the Alps for Tuesday, despite Brussels allowing temporary aid to farmers being squeezed out of the market.
Portuguese farmers said they were waiting for the outcome of parliamentary elections on Sunday before targeting a new government with action there.
EU agriculture commissioner Mariann Fischer Boel has offered to relax conditions for member states that buy up producers' maximum production quotas from those wishing to quit the business, saying it would allow national governments to offer temporary aid of up to $22,200 per producer.