1. The Edinburgh modified gage for laying hens
2. Straw and food as reinforcers for prepartal sows
3. Assessment of positive emotions in animals to improve their welfare
4. Brambell Committee.1965.Report of the Technical Committee to Enquire into the Welfare of Animal Kept under Intensive Livestock Husbandry Systems. Command Paper 2836. Her Majesty's Stationery Office London.
5. The identification of abnormal behaviour and behavioural problems in stabled horses and their relationship to horse welfare: a comparative review;Cooper JJ;Equine Veterinary Journal Supplement,1998