The President of the Irish Farmers' Association (IFA) and his 11-year-old son are travelling to Brussels by tractor as part of a Europe-wide protest.
Francie Gorman and his son Tom set out from the Irish Farm Centre in Bluebell, Dublin, with a small convoy of other tractors following behind them.
Their route sees them travelling south to catch a ferry from Rosslare in Co Wexford to Dunkirk in France.
They expect to reach Brussels for a wider protest organised by the European farm umbrella body COPA COGECA on Thursday.
The father-son duo were in good spirits as representatives from many regional IFA groups waved them on their journey.
Mr Gorman said the protest was going to be one of the biggest demonstrations organised by COPA COGECA and that IFA staff had "worked tirelessly" to get the Irish delegation ready.
"I want a farming future for Tom the same way thousands of other farm families all over Ireland and Europe want their farm to be viable for the next generation," he said.
"Tom and I are travelling over to deliver that message to the EU institutions next Thursday."
The Brussels demonstration will coincide with an European Council meeting that is due to discuss the next EU budget, including on the Common Agriculture Policy.
Mr Gorman said: "The initial proposals would leave a significant gap in funding for the CAP programme post 2027.
"We will be standing with our colleagues from across Europe to deliver a strong and united message that an adequate budget is needed across the twin pillars."
The IFA is also critical of the European Commission’s proposed Mercosur trade deal with Argentina, Brazil, Paraguay and Uruguay.
