Table 47.

Hazards that could lead to the occurrence of abnormal behaviour. Hazards written in bold are scientifically proven by more than one source, those in normal text were found in only one paper, those in italic have been mentioned by the experts invited to the technical hearing meeting

Hazard category	Hazard
Housing	Individual housing Very low cages (20 cm) Lack of gnawable materials (e.g. roughage, wood), especially in (larger) groups
Ambient condition	No hazard identified
Genetics	No hazard identified
Nutrition and feeding	Feed restriction
Management of biosecurity	No hazard identified
Management of reproduction	Disturbance of maternal behaviour
Other	Sub‐adult animals