Very Young Steer Weaners. The majority of these calves are sired by the Poll Hereford Bull backing up the AI program and were born in Nov/Dec. All the hard work has been completed. Yard Weaned, Drenched, Vaccinated and well handled. Calves have all been yard weaned and drenched over the last 3 weeks in their various mobs with the last animal health treatment being 4th May.