David Cameron can 'make a pig sigh' by scratching its back and 'castrate a ram with a pair of pliers'

New biography sheds light on PM's love of rural life - a day after extracts revealed claims that he put his genitals in a dead pig's mouth

David Cameron milks a lamb during the election campaign (PA)

David Cameron has boasted of his ability to "castrate a ram with a pair of pliers" and can also "scratch a pig's back so effectively that the creature sighs", an upcoming book claims.

It sheds light on the Prime Minister's love of rural affairs and says he is still an "avid supporter of hunting". The book claims he still helps the controversial sport "behind the scenes".

Mr Cameron told a journalist about his farming talents on a visit to a farm in the Cotswold, according to the new biography, titled Call Me Dave and co-authored by former deputy Tory party chairman Lord Ashcroft and journalist Isabel Oakeshott.

David Cameron with Florence the piglet during a visit to a farm in Witney in 2014. (Rex Features)

News of his farming skills come a day after extracts of the book, published in the Daily Mail, made the extraordinary claim that Mr Cameron put his genitals in a dead pig's mouth as part of an initiation ceremony for the elite Piers Gaveston drinking club at Oxford University.

Publicly Mr Cameron has refused to “dignify” the allegations with a response, but he has told those close to him that he was never a member of the group.

The book, due to be published next month, quotes a “distinguished Oxford contemporary”, who is now an MP, recalled how Mr Cameron took part in an “outrageous” initiation

“His extraordinary suggestion is that the future PM inserted a private part of his anatomy into the animal’s mouth,” an excerpt published by the Daily Mail reported.

The MP claims to have seen a photo of it, but the alleged owner of the picture did not respond to the authors' approach and they accept it could be mistaken identity.

In today's extracts of the book, which is due to be published next month, Mr Cameron allegedly stepped in to save a constituent from being prosecuted under the Hunting Act.

As Leader of the Opposition Mr Cameron intervened after a professional huntsman from his constituency in the Cotswolds was charged with various offences of hunting a fox.

It is an embarrassing allegation for the Prime Minister, who pledged to repeal the Hunting Ban at the 2015 election.

During the election campaign he said people must have “the freedom to hunt”, insisting the Hunting Act has “done nothing for animal welfare”.

After winning a slender majority and with a raft of Tory MPs opposed to repealing the ban, Mr Cameron decided to pursue a relaxation of the ban rather than an outright repeal.

However the move was dropped after the 56 SNP MPs decided they would vote in the Commons motion, despite the change of rules only affecting English law.

The Government is hoping to return to the issue once it has passed English votes for English laws, which would weaken the ability of Scottish MPs from voting on legislation that does not affect their constituents.