Hi Delvyn. Some Canadian cattle ranchers do use growth hormones in beef cattle, and their use is highly regulated. It is possible that the beef purchased for McDonald's Canada could come from cattle that have been raised using hormones. As part of the Health Canada guidelines, the cattle rancher must maintain a prescribed withdrawal period to ensure there is no synthetic hormones residue at time of slaughter.
Canadian farmers may use antibiotics, under the guidance of a veterinarian, when animals are sick, susceptible or exposed to illness. Their use is federally regulated and strict withdrawal periods are required so that all residual antibiotics are below established, acceptable levels prior to slaughter.