In the stable where I work, there is a stallion who seems to be gay. Or at least in love with a gelding. When the stally sees him, he became all excited, neighing, pawing at the ground, getting ready for breeding. At first we thought it was dominance display, but he only do it with that certain gelding. We even tried him to tease a mare, and he was totally unintrested.

No idea on that, but look up the thoroughbred stallion War Emblem. He was notorious for showing no interest in mares and flat out refused to breed many of the ones sent to him.

Well as I recall in the movie the Black Stallion they trained a gelding to play the part of Johar (the white mare) during the courtship scenes, and rumor has it Cass Ole was confused the next breeding season for a few sessions.

As geldings are not "natural" it could be prossible that studs get confused or attracted by them - maybe due to a certain scents because their hormones get messed up.

There are recorded instances of homosexuals in almost every species. It is possible some Stallions are simply 'confused' by Geldings as they do not behave the way a Stallion may,and they do not release Stud pheromones.

I totally agree with Kuewi. Animals are animals. There are males and there are females. They don't get confused. They may show a preference as to the gender of their companion but this does not in any way make them "homosexual".

I should have clarified and stated homosexual behaviour. Which does in fact occur in almost every recorded species. What is pretty cool is in most species it plays a part in their evolutionary development.

Wow, this turned weird quickly. Taht's possible, that he confuse by the pheromones. Though I think, it's still strange, that he behaves that way with only one gelding.