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Four groups of five Danish Landrace gilts (L) and four groups of five Duroc gilts (D) were put in eight multi-activity pens. The pigs' use of three specific stimuli, straw in straw rack, logs suspended in chains and a 12 kg stone placed on the floor, was observed for two periods of 10 min, each week for 3 months. The pigs were weighed every other week. Total activity levels increased for both breeds...
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