[ProtectOurFreedom]

That sounds ridiculous, so I Googled "do cows give more milk aligned north south and, sure enough, there's a lot of evidence that cows do sense magnetic and electric fields. One paper:

Cows: a big model for EMF research, somewhere between Vet-Journals and “Nature” by Maren Fedrowitz, Sep 05, 2014, Department of Pharmacology, Toxicology, and Pharmacy at the University of Veterinary Medicine, Hannover, Germany.

Some researchers report seeing cow and deer herds align N-S on Google satellite images!

[DBrow]

“sure enough, there’s a lot of evidence that cows do sense magnetic and electric fields.”

So in an indoor farming situation well-placed Nd:B magnets would increase yield by orienting the magnetic field to however the barn was originally built.