Figure 1From: Artificial light programmes in entire male pig production – effects on androstenone, skatole and animal welfareAverage percentage of animals showing aggressive behaviour related to access to feed, other aggressive behaviour and mounting, per section and week. In week 10 the day lengths were 13 and 12 1/2 hours, in week 14, 10 3/4 and 14 3/4 hours, and in week 17, 8 1/2 and 18 1/2 hours in section I (autumn) and II (spring) respectivelyBack to article page