Although the statement about the cows understanding is arguable, its common knowledge cows, sheep, etc. etc. occassionally get born with sex organs of both genders too. Also, animals of a certain gender regularly display traits of the opposite gender. This without being clearly homosexual (so who knows how they actually identify?)
Holy shit, people suggesting that cows "identify". It's like half the world has gone mad as a hatter! Alright, let's settle this by seeing who can pee the furthest.