I guess you better get down here and tell the horse that he’s not supposed to be successfully digesting those seeds!!
As weird as a bunny mom I am, I am a horse mom. I go through his poop on occasion and barely any seeds go through uncracked (he had more uncracked seeds in his poop when he was first started on it, but now the majority have been chewed). Perhaps because he is an easy keeper he only gets a handful of a dry vit/min pellet supplement and the flax seeds, so maybe he thoroughly chews it to make the most of it. But whatever the reason, I USED to give him ground flax for ages before changing him to whole flax, and in a short time, the difference was ASTOUNDING. Plus he gets the lubricating qualities for his gut with the seeds that don’t.
Remember, the fresher the better… so even if some are not digested, those that are cracked (and let’s not kid ourselves, healthy horses are very good at grinding their food) are far more potent than flax that has been ground and already exposed to oxygen, light and heat.
There are lots of case studies of horses and whole flax seeds. But like everything, you have to look at the individual. I don’t doubt that some horses simply swallow them, since they’re so small, especially if you feed it with a moist grain of some sort.
But I think I’ll stick with feeding the oil only for the bunnies… even if just to make sure that both bunnies get their fair share. There would be no way of making sure one bunny doesn’t eat them all. =/