Nathan - I see by your website that you are quite learned in equine reproduction. Excuse me, but I've had actual experience breeding large & small equine for decades. I respectfully disagree with your position.
It seems with big equine, you can breed a mare to a larger stud with minimal complications. With the minis, if a much larger stud is used, the mare can have great difficulty delivering that foal. No, I don't believe it will grow larger than the uterus can accomodate, but I do believe it can grow larger than birth canal can accomodate.
Sorry, I beg to differ with your stance. I have educated myself as much as possible without attending university & obtaining degrees in equine studies. To me, where horses are concerned, experience and the knowledge that comes with it, counts a whole lot too. I'm not implying that your education and experience would not qualify you to make such an observation, only that those with much direct experience with miniatures may look at it in a slightly different light.
I understand your use of the term INCREASE in risk. I still disagree. I believe there is an increase, yes. But I also believe it is a big increase in risk, (of breeding large stud to small mare) due the the statements I made above. Your thots?
Whew! Is it getting hot in here?