Herd animals detecting magnetic field

I was reading that there was a study done about animals detecting the earth’s magnetic field.  The study showed that cows and deer tend to align their bodies in a north-south direction.  The scientists say they are surprised that hunters and herdsmen and farmers didn’t notice it.  Who says farmers didn’t notice it?  Did they ask any farmers?  Maybe farmers noticed it but were too busy farming to care about something like that and get all excited about it and report it to a scientific community.  I mean really, why would a farmer even think that anyone would care about something like that?  Big whoop!