The Daily Mirror published a report, accompanied by apparently incriminating photographs, alleging that workers had played rounders using turkeys as a ball.
The company admitted it had received enquiries from retailers and 150 phone calls and e-mails from worried members of the public. But a spokesman for the supplier said: "The people involved have been suspended pending a thorough investigation of the matter. We recognise that our systems have failed and are carrying out an immediate review."
It was too early to tell whether sales of Bernard Matthews-branded products had been affected, he added.