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A growing interest has been shown in alternative pig production because of the low capital cost of outdoor systems and awareness of niche marketing opportunities (Gentry et al., 2001). However, available data on productive performances and pork quality for free-range or confinementreared pigs widely vary among studies: several factors could be confounding results such as climatic and environmental conditions, genotypes evaluated or others (Kleinbeck and McGlone, 1999; Gentry et al., 2001)...