Originally Posted by Corporal
Bone density comes from pounding work, not from genetics.
Absolutely. Also not just pounding, but aerobic exercise helps build bone. There are many cushy-kept horses with big but weak bones, due to lack of use. Size of P3 also doesn't seem to have anything at all to do with the endemic degree of osteoporosis we see... so common that it is thought of as normal in many circles! Genetics certainly plays a part, but IMO the vast majority of factors are down to environmental - eg diet, lifestyle, management...