What makes you think that way? Why would you feel that AMHA is trying to bring in more oversized horses just because they brought the permanent papers to 3 years? I personally have never had a Miniature horse grow after 3 years old. Many stopped growing at 2 years.
Please do not put words into my mouth. I did not say I think AMHA is trying to bring in oversized horses. I am merely saying that I feel that this is going to be the end result. Seems we (AMHA) has worked very hard throughout the years to keep the horses under 34", and I personally feel they have been somewhat more successful in doing so due to their having the permanent height measure at 5 years. I have seen MANY, MANY(MOST) of my horses grow beyond 3 years of age.
My missunderstanding, I thought you felt that AMHA was doing this to make more money. Whether AMHA gives permenant papers at 3 years or 5 years, it really does not matter. If someone is going to say their horse is under 34" and it is really 36", they will say it whether it is 5 years old or 3 years old. How many horses do you see out there who are perm. registered 33 3/4" tall, You can gurantee that most of them are oversized.
For the honest ones who turn in their papers, I would imagine if their horse goes over at 5 years old, they are still going to turn in their papers.
I am one who belives that if the horse is registered as an AMHA horse, it should not loose its papers just because it is over. Still the same horse, still able to produce horses that are under. Back to the old argument, that if we are going to make this a breed by closing the books, then none of the horses should loose thier papers, they just can not be shown.
In the dog show world, a Tibetan Terrier has to be 14" to 16" for a bitch and 15" to 17" for a dog. Just because one may go over, does not mean it is no longer a Tibetan Terrier, it just means it can not be shown. One just has to be careful what one breeds the larger dog to. It should be the same in the Miniature AMHA horse World.
Frankly, in 10 years of having and breeding Miniatures, I have never had one grow after 3 years. I even bought one as a yearling that at 2 years old was 34". She is now 5 years old and still 34".