Words: Nadene Hall If you buy day-old, commercially-bred hybrid chicks from a hatchery they will have been vaccinated against two major killers of free-range poultry: Marek’s disease and salmonella. If you buy professionally-reared commercial hens at point of lay they may also be vaccinated against several more common diseases, like Infectious Bronchitis (IB). When companies … Continue reading Signs of a healthy hen