cows eating pellets- Glen Nicoll

McKinnon: The math behind animal nutrition lingo

When I visit with producers about their feeding program, I often get questions on “nutrition lingo.” Examples include questions on the meaning of a mineral or protein supplement tag or how much supplement do you need to feed to achieve an ionophore concentration of 22 or 33 ppm? Such confusion is understandable, particularly when you […] Read more

McDonald’s in 2015 launched a billboard campaign in Canada profiling products made using Canadian meat and potatoes. (Dave Bedard photo)

McDonald’s Canada to tighten antibiotic policy for chicken

Following its U.S. arm’s move this spring, McDonald’s now plans to source only chicken raised without medically important antibiotics for its restaurants in Canada by the end of 2018. And Canada’s chicken producer group says the Canadian chain’s move dovetails with a direction the Canadian industry was headed already. “McDonald’s believes antibiotics have important benefits, […] Read more


There is no evidence that ionophore use in livestock increases resistance to other antibiotics that are important in cattle or human medicine.

Are ionophore antibiotics a risk for antimicrobial resistance?

Last month’s column talked about Health Canada’s initiative to phase out growth promotion claims for medically important antibiotics by December 2016. This will impact three antibiotics (tetracycline, sulfamethazine and neomycin) that have growth promotion claims in beef cattle in Canada. It will not affect ionophore antibiotics like Rumensin, Bovatec, or Posistac. Ionophores are used widely […] Read more

calves and cattle in a feedlot

Do antimicrobial growth promoters for beef cattle really improve performance?

Ionophores (Rumensin, Bovatec, Posistac) are not medically important because the ionophores approved for use in cattle are not used in human medicine. Other antimicrobials used in livestock are medically important. Concerns around antimicrobial resistance in both human and veterinary medicine have led to increased scrutiny regarding how medically important antimicrobials are used in livestock production. […] Read more