No alignment of cattle along geomagnetic field lines found

TL;DR

This study analyzed cattle orientations on European pastures using satellite images and found no evidence of alignment with geomagnetic field lines, challenging previous claims of magnetoreception in cattle.

Contribution

The paper provides a rigorous, independent analysis showing no alignment of cattle with geomagnetic fields, addressing prior conflicting findings and potential methodological biases.

Findings

No alignment of cattle with geomagnetic field lines was observed.

Methodological issues may explain previous positive findings.

Satellite image analysis can be inconclusive due to biases and image quality.

Abstract

This paper presents a study of the body orientation of domestic cattle on free pastures in several European states, based on Google satellite photographs. In sum, 232 herds with 3412 individuals were evaluated. Two independent groups participated in our study and came to the same conclusion that, in contradiction to the recent findings of other researchers, no alignment of the animals and of their herds along geomagnetic field lines could be found. Several possible reasons for this discrepancy should be taken into account: poor quality of Google satellite photographs, difficulties in determining the body axis, selection of herds or animals within herds, lack of blinding in the evaluation, possible subconscious bias, and, most importantly, high sensitivity of the calculated main directions of the Rayleigh vectors to some kind of bias or to some overlooked or ignored confounder. This factor could easily have led to an unsubstantiated positive conclusion about the existence of magnetoreception.