Die Lateralität des Pferdes: Erfassungsmethoden, genetische Parameter, Auswirkungen auf die Zügelspannung und Pferd-Reiter-Kommunikation.

The present manuscript provides an overview of a large study, which examined the relation of laterality test results in horses obtained on the ground with laterality during riding, the interaction with human handedness and the heritability of the lateral displacement of the hindquarters. It compared 12 different laterality test methods on the ground and during riding between 5 groups of horses (N = 6.553) and examined rein tension of 110 rides (88 horses, 65 riders). Rein tension was analysed using linear mixed models. The relation of test methods was investigated using cross-tabulations, chi2-tests, phi and Cramer's V, as well as Pearson-correlations. Heritability was estimated using uniand bivariate linear animal models in DMU6. Laterality test results obtained on the ground did not agree with laterality during riding (p > 0.05). Only the rider's assessment of their horse's laterality (p = 0.02) and the lateral displacement of the horses hindquarters (p = 0.003) allowed conclusions. Heritability was high (warmbloods, n = 3.973) and low to moderate (Thoroughbreds, n = 1.822). The magnitude and symmetry of rein tension was mainly influenced by horse's laterality (p = 0.04 and p = 0.003) and rider's handedness (p = 0.0003). [ABSTRACT FROM AUTHOR]