I started endurance on a little
QH - 14.2 but his ideal wt is 950 lb. He did his first CTR & endurance
at age 18. What I have learned from him is that QH take a little
longer to develop the distance muscles but they certainly can. He's a
black bay and even in 100+ temps recovers as fast or faster than some
Arabs. Feed hi fat feed like, Ultium or XTN - there are
others. With QH it's best to avoid the hi sugar feeds.
Since Jim is in his 20s
(turning 26), I have a younger guy I've been bringing along. Danza is
a 15.3 QH and 1050 -1100. From age 5 - 8 we just did a lot of LSD, speeded
up in 2007 and did 2 - 1 day 100 in very nice time. Then he tor a hind
suspensory & has been out for a year. Fully healed now & completed
a nice 50 in Nov in 5.5 hr.
My point is, yes they can.
It just takes a little different strategy. The LSD builds long lean
muscle. I'm still battling some bulky muscle on Danza. I know with
the next 1000 miles it will be gone.