Labour’s proposal to loosen planning regulations for farmers will deluge rivers with chicken faeces, environmental campaigners have warned. The environment secretary, Steve Reed, promised farmers on Thursday they would be able to build larger chicken sheds, but experts have said this would create “megafarms” and contribute to river pollution. Speaking at the annual Oxford Farming Conference, Reed was attempting to rebuild confidence with farmers after widespread anger over changes to inheritance tax and cuts to subsidies. A small protest formed outside the Examination Schools in Oxford where he was speaking and tractor horns partially drowned out his speech. Reed said: