Unlike humans, most digestion happens in the intestines and not in the stomach. Do not make sudden changes in the diet. The horse will become constipated or have diarrhoea. The only exception is if the horse is suddenly seriously ill or if a very fit horse is injured and taken off work. Wait one and a half hours after feeding before working horses.
Digestion is a slow process.
If the horse is worked with a full stomach the pressure can rupture the stomach or affect the respiration. Exercise also alters the nervous condition of the horse which can interfere with digestion. Feed plenty of succulents such as carrots. Put some in the feed every day. The information given is for general information and should not be regarded as advice in any matter.