Early on, there was criticism of the policy of the Canadian AI units to remove bulls found to carry red. A number of superior bulls were slaughtered or exported. The studs were simply supporting the Canadian policy to prevent the intensification of the red recessive in the breed. The phrase "carries the red factor" had to be included in the description, and excessive promotion of unproven red-factor bulls was discouraged. They later added the aim of permitting intelligent breeders to use any red-carrier sire that had an outstanding proof for production and type.