I recently bought a 3 yr old TWH gelding that was a good 300 lbs underweight and 15.2h. I was told he would mature out at 16h. I have heard also that they grow in height till 5yr and fill out until 7 yrs, is that accurate ? But his damn is 15.2h and sire 16h and I have also heard they usually get there size from the damn. So is it a possability he may make 16h ? I hope so, my other two are 16.2.
I can't agree that they get their height from the dam. My fifteen hand mare's first foal...a filly is 16 hands, the sire is about 15.1h. The 16h mare has a 2 year old colt that is 16.1h headed for 17h. Sire of that one is 17.2h. He turns two on April 5. Mine are quarter horses though, Walkers may mature slower.
Research results suggest that with a higher dam and a lower sire the resulting foal will be slightly smaller than the dam; while with a higher sire and lower dam, the resulting foal will be slightly higher than the dam. In other words the dam influences the height relative to the sire input. There are however always going to be exceptions - you're not mixing hot and cold water to get warm!
WRT the age of maturity, again, breed and individual differences will abound. There is no "standard", and one cannot make major assumptions. As a general rule maximal height will be attained by the age of seven. Or before...
It seems like all of our horses have stopped growing "up" by age 5. Our stallion is 8yrs this year and up until last year, he was still filling out too.
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