Originally Posted by danastark
I forget whether there is an optimum age to do the string tests or not. Seems like I recall doing it at 2 yrs. Of age. It did work for my gelding. He was 14.3 at 11 mos. I did the string test from knee to coronet and it had him at 18 hands. He is 6 now and 18 hds. Goodluck with yours if they truly end up so big. My guy did end up bigger than his sire, BTW. The sire was 17.2, don't know about his dam.
Dana, somehow I missed your post at the bottom of the last page. I was hoping you'd weigh in because I knew you had a big guy you had gotten a hold of quite young.
So it IS possible for them to grow taller than their tallest parent. I would not have thought that! It's a rarity in the dog world. Well, you know, I correct myself, it is rare in purebreds, but not unusual in mixed breeds. In the farm collie community I am associated with, a lot of people are intentionally crossing Rough Collies like mine (generally around 55-60 lb dogs) with English Shepherds (generally around 65-70 lb dogs) and the resulting pups are often maturing at over 100 lbs. The breeders are claiming "hybrid vigor" which I think is a lot of hogwash when you are talking two breeds within the same species, but there definitely is some genetic "play" when crossing breeds. I don't know why I wouldn't have assumed the same could be true for horses.
I had always grown up hearing that you should string test a horse at 6 months, because at that age the cannon bone stops growing and has reached adult length. But I've heard on these boards a lot of people mention it used from birth on, so I just thought it was worth a try with Fiona. I don't even want to think what it's going to come out as once her cannon DOES stop growing!