Fig. 5

Percentage of piglets with kinked tails (%) by relative tail length (monofactorial linear model estimated with probit function). Each group contains 20% of all piglets (n = 66–67). The relative tail lengths (length from tail tip to tail base/length from ear base to tail tip*100) are shown as the labelling of the x-axis. Differences in percentage of kinky tails were significant (P < 0.001). Significant groups are marked with different letters