Queues formed at independent butchers shops in Glasgow as more consumers chose to buy locally produced beef and pork.
At Andrew Gillespie's in Anniesland, Elaine Eadie, 44, from Maryhill, said: "It's shocking.
"I think someone should be made accountable for selling things that aren't what we thought they were. It's a betrayal of our confidence.
"I don't buy branded frozen foods myself but a lot of people on a tight budget think it's a cheap way of feeding your family. However, I'm spending around £15 on beef mince, beef ham and Lorne sausage that will I will cook myself and which will feed my family for four or five days. If you cook it yourself you know what's in it."
Kris McKelvey, manager of Gillespie's, said: "Hopefully, this scandal will finally get the message through that local independent butchers are more reliable than supermarkets because we don't sell pre-packaged stuff which is basically made from the cheapest of the very cheapest off-cuts."
At Rodgers Butchers in Byres Road, manager Paul Holloway said: "The supermarkets have been killing off local independent butchers' businesses for years, and getting away with it, so hopefully this will change things for the better."