Figure 1.
Figure 1.

Timing of first treatment of tail damage due to tail biting in tail biting pens (TB pens) per week in relation to arrival to the boar testing station. Pigs were approximately 12 wk of age at arrival.

 


Figure 2.
Figure 2.

Weekly average number of visits to the feeder per pig per 24 h (least square mean ± SE) for pigs in tail biting pens (TB pen) and control pens (Con pen). Significant differences between pen types for each week are indicated with ** for 0.01 ≥ P > 0.001 and * for 0.05 ≥ P > 0.01, and tendencies are indicated with † for 0.1 ≥ P > 0.05 (for all pairwise comparisons with P < 0.1: t > 1.76, df = 487). DFV = daily frequency of feeder visits.

 


Figure 3.
Figure 3.

Weekly average feed intake per week per pig [g/day; least square mean (LSM) ± SE] for pigs in tail biting pens (TB pens) and control pens (Con pens). Significant differences between pen types during the same week are indicated with ** for 0.01 ≥ P > 0.001 and * for 0.05 ≥ P > 0.01, and tendencies are indicated with † for 0.1 ≥ P > 0.05 (for all pairwise comparisons with P < 0.1: t > 1.73, df = 487). The LSM is not presented for –10 wk due to very large SE values. DFC = daily feed consumption.

 


Figure 4.
Figure 4.

Weekly average number of visits to the feeder per 24 h [least square mean (LSM) ± SE] for victims and nonvictims in tail biting pens (TB pens) and controls in control pens (Con pens). P < 0.1 from 2 to 5 wk before the start of the tail biting outbreak, ranging from P = 0.002 to P = 0.06 (for all pairwise comparisons with P < 0.1: t > 1.60, df = 6,500). The LSM are not presented for some weeks due to very large SE values. DFV = daily frequency of feeder visits.

 


Figure 5.
Figure 5.

Weekly average feed intake [g/day; least square mean (LSM) ± SE] for victims and nonvictims from tail biting pens (TB pens) and controls from control pens (Con pens). P < 0.1 from wk 0 to 2 after the start of the tail biting outbreak, ranging from P < 0.001 to P = 0.07 (for all pairwise comparisons with P < 0.1: t > 1.79, df = 6,500). The LSM are not presented for some weeks due to very large SE values. DFC = daily feed consumption.