Badger cull licences have been issued by the government despite its own scientific adviser saying there is “no justification” for doing so.

Leaked documents seen by the Guardian show the Department for Environment, Food and Rural Affairs this month issued 17 new licences to continue culling badgers, overruling Dr Peter Brotherton, the director of science at Natural England, the government’s adviser for the natural environment in England.

Badgers are culled to the point of local extinction because they spread bovine tuberculosis (bTB) to cattle, and the disease can wipe out entire herds. Last year, figures released by Defra revealed more than 210,000 badgers had been killed since the cull began in 2013. However, scientific reports have shown that killing badgers is not the most effective way to end the disease.