immunodepressed - in a state of diminished or impaired immunity, such as may be brought on by cytotoxic chemotherapy or irradiation or by certain disease processes
After the first days of conditioning, the lighting regime shall be such as to prevent health and behavioural problems. Accordingly it must follow a 24-hour rhythm and include an adequate uninterrupted period of darkness lasting, by way of indication, about one third of the day, so that the hens may rest and to avoid problems such as immunodepression and ocular anomalies.
