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2. Proposal for a Council regulation (EEC) concerning minimum standards for the protection of pigs kept in intensive farming systems;Commission European Communities,1989
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4. Locality registration as a way of oestrus detection in an integrated group-housing for sows;Houwers,1988
5. Variations in motor activity and in food and water intake over 24 h periods in pigs;Ingram;J. Agric. Sci.,1980