As I understand it, the urine is still collected but the mares are bred to nice warmblood horses and the babies produced are known as 'Canadian Sport Horses', and a very nice breed too. They're very versatile and sought after for all around showing. I mean, any pregnant mare will produce hormonal urine when she's pregnant, so why not make the baby worth something too.
For that reason, I didn't think it was so much of a problem anymore. Also, the fact that premarin has been discredited as a viable medication.