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The vector data: for sampling the vector data (cows with recognized head position), only pictures with very good resolution were used. Shadows were never used in our analysis. Regarding the claim that the north-west bias of the head sample is caused by an inadequate sampling, it can be easily checked that the axial statistics made from these vector data gives Z = 1.1. Attaching them to the rest of axial data could not influence their directional preference. So, the reasoning given in Begall et al. (2011) is un-tenable and our conclusions resulting from the vector sample remain valid.
Re-analysis of the “green” herds: denoting the results of our paper mostly as noise...
KeywordsMagnetoreception Magnetic alignment Cattle in magnetic field Magnetic sense Statistical evaluation
- Begall S, Burda H, Červený J, Gerter O, Neef-Weisse J, Němec P (2011) Further support for the alignment of cattle along magnetic field lines: reply to Hert et al. J Comp Physiol A doi: 10.1007/s00359-011-0674-1