It is pointless killing cattle in an attempt to control TB unless wildlife is also culled, Preseli Pembrokeshire AM Paul Davies has told the Senedd.
He highlighted the problem while questioning First Minster Rhodri Morgan about the efficacy of current TB control methods.
"Over the past 10 years, TB has caused huge problems within the industry," he said.
"It is clear that the current policy of culling cattle without controlling wildlife is not working.
"In my opinion, it is not sensible to destroy one set of animals without controlling the other."
Mr Morgan said that a new TB policy is being formulated but that in the meantime the main priority was to emphasise the way in which animal movements are controlled.