Fig. 2

Proportion (%) of pigs affected by a tail¹, b ear² and c skin lesions³ at 4, 7, 9, 16 and 24 weeks of age in a group of 240 finisher pigs from one batch born within 1 week that was followed from birth to slaughter in a farrow-to-finish commercial farm. All animals were slaughtered at 24 weeks of age and were retrospectively classified into three production flows (i.e. Flow 1 = 'on time/normal', Flow 2 = delayed 1 week and Flow 3 = delayed > 1 week) according to the time they required to be moved to the next production stage. Pigs were selected from each flow in a nested case control study matched by sow parity, number of piglets born alive per litter and birth weight. ¹ Evidence of chewing or puncture wounds, but no evidence of swelling; or evidence of chewing with swelling and signs of possible infection; or evidence of chewing with severe swelling/infection or an open wound where the tail used to be (Harley et al., 2012). ² Superficial bites but no blood; or evidence of bites/teeth marks with fresh blood and/or infection; or partial or total loss of the ear (Diana et al., 2017). ³ Lesions arising from aggression and scored as several superficial scratches not penetrating the full dermal thickness; or deep cuts lesions with or without red/dark scabs or severe laceration with infected wounds and/or dark scabs (O’Driscoll et al., 2013)