Perhaps it's the same reason that in the Yudkowsky vs Hotz podcast yesterday, Hotz didn't know what a gelding was despite being incredibly smart -- zero farm experience.
To be fair, geldings aren't really a part of modern farm life. Steers and barrows are still common if you're in livestock, maybe wethers, but horses are more a hobby and only coincidentally associated with farms.
I mean, farms come in a lot of varieties. Entirely possible for one to be successful at cranberry farming but know little about many/most/all animals (that don’t attack their crops).