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Mean cumulative rating score (CRI) and standard error of the mean in the three systems (pens with farrowing crate = FC (n = 34 sows), single loose housing pens = LH (n = 32 sows), group housing system = GH (n = 36 sows)) on different examination days. Different letters within one examination point mark significant differences (P<0.05). Significant differences within one farrowing system between examination points are marked by * (P<0.05) or *** (P<0.001).
