The science behind the badger cull
27 August 2013 Last updated at 16:09 BST
An eight year trial carried out in the 1990s concluded that culling badgers would help tackle tuberculosis infection in cattle.
But the study showed it would only have a slight impact on the spread of bovine TB and now a scientist behind it says England's pilot cull is a "crazy scheme".
Pallab Ghosh reports.