I've never had a stallion that was particular over the mares he bred - especially when they're squatting, peeing, knickering - pretty much on their knees begging for it... And he just won't.
I have two mares right now that are like that, and he just won't have nothing to do with him. He'll get mad and pin his ears at them and if I try to hand breed, he literally will just sulk on the end of the lead rope - either stand there all dejected with his pecker sucked up so far it looks like he's a gelding, or he'll stare off in the opposite direction towards the mares that are NOT in heat.
This is the second heat cycle with these two mares that he's done it with, and I have no idea why he's so adverse to them - both mares are good breeders, stallion passive, and seriously, they just want to get laid. *I* want them to get laid. Just the stallion doesn't.
He's covered other mares previously already, so he more then knows what his big cojones are for. He's a good talker, gentle, but usually gets the job done like any male in the right mind with a begging female in front of them would do. Except with these two mares.
Has anyone dealt with this before? Any suggestions on what to do?