They can' t associate overeating with the ensuing bellyache from colic or loss of hooves from founder. This tendency has practical implications. Wild horses in the center of the herd were safer from attack. This can be seen today with zebras in Africa. The gregarious tendency can be taken advantage of in training young horses.
Most Western horses walk too slowly and jog too fast until well trained.
A good training method is to jog them away from the barn and walk them toward it. Barn-sour horses result from allowing them to run back to the barn where they are promptly unsaddled and fed. The routine should be changed so this is not expected by the horse. Try to avoid situations that produce barn-sour horses. Young horses should be sufficiently trained to be obedient before they are asked to leave the premises with a rider.