Footage allegedly showing sheep being killed when not stunned properly and being dragged by their legs and throat has been obtained by an animal welfare charity.
A criminal investigation is under way and Wrexham Abattoir has made no comment.
Animal Aid’s Tor Bailey said: “Without our covert cameras in place, this horrendous situation may have continued unchecked for some time.
“We’re calling on the Welsh Government to introduce independently monitored mandatory CCTV without delay across Wales.”
CCTV is not compulsory in Welsh slaughterhouses and the charity said it should be brought in as a “necessary safeguard”.
A Welsh Government spokesman said: “We take animal welfare at slaughterhouses very seriously.
“As a criminal investigation is under way, we are unable to comment further at this stage.”
The Food Standards Agency – which is carrying out the investigation – said: “We took swift action to increase our presence at Farmer Fresh in Wrexham and to introduce additional checks and ensure animal welfare was being protected.”
Original source: www.bbc.com