Health of Laying Hens in an Aviary System over Five Batches of Birds

Mortality and health were studied in laying hens kept in an aviary system on a practical scale. All manage-ment inputs were done by university staff. Five batches of birds (trials) during a period of 6 years with approximately 4 700 birds per trial were included in the study. The aviary was a three-tiered “Marielund” system divided into 4 pens. Three hybrids, reared on lit-ter with access to perches, were used; Lohmann Selected Leghorn (LSL),...