So, what I've been wondering, is why don't they just use horses from America? I believe UCONN uses/breeds their own, since they're all morgans.
I've played at UCONN many times within the past six years, and many UCONN horses are actually donated by polo players (my grandfather actually donated the very first UCONN polo pony, a horse called Spinner, many many years ago). Sometimes, they are from high-level professionals who only need the horse during a few years of their peek performance, and then donate the horse to UCONN where they know it will be well taken care of. Maybe a handful of horses bred at UCONN (though I don't believe they have an actual breeding program), but the majority are from the USA and all over the country. They do not ONLY use morgans, but actually the majority of the polo ponies are thoroughbreds, or at least partially thoroughbreds. Unless the riders are professionals, or they are very wealthy, most riders will try many different breeds for polo ponies. They have used paints at UCONN, and they even have a saddlebred that they use for polo (one of my favorite ponies there!!). They get new horses periodically almost every year, and even have a horse auction once a year so they're always getting new additions to their string.
Overall, I have only positive things to say about UCONN polo. They have one of the nicest facilities in the northeast, a very very well taken care of and talented string of ponies, and the people in the UCONN horse program are extremely helpful, talented, kind, and they take such great care of their ponies.