The Effect of the Type of Non-Caged Housing System Genotype and Age on the Behaviour of Laying Hens

摘要

For several years, a constant decreasing trend has been observed in the number of hens housed in the cage system in favour of non-caged systems, i.e., deep-litter, free-range and organic systems. This study investigated the welfare of laying hens in different non-caged housing systems, namely a deep-litter barn system, a free-range system and an organic system. The study was conducted on hens of a native breed Green-legged Partridge (Z-11) and Hy-Line Brown hybrids. Dustbathing, scratching, wing-leg stretching, wing flapping and preening were recorded as comfort behaviours. Pecking, fighting, threatening and chasing were recorded as agonistic behaviours. The native breed of hen chose to use the outdoor area more often than the commercial breed of hen, which may be a result of better adaptation to the local environmental conditions. The type of non-caged egg production system influenced the percentage of hens displaying comfort and agonistic behaviours in these laying hens. A greater proportion of comfort behaviours were observed in the free-range system and organic system compared with the deep-litter system, which may indicate a higher level of behavioural welfare of laying hens in these systems.