The problem with the schedules above, is they go too fast to allow horse to develop the needed stomach flora to digest grasses instead of hay. It takes at LEAST 3 weeks to get stomach flora built up for food changes, so when you let horse graze for more than a SHORT TIME (like 30 minutes) you risk his digestive system shutting down. He can’t digest what he has eaten, no grass flora in his gut to manage the new food.
Going so quickly is a GREAT way for horse to colic or get laminitus!! So if you want to hurt your horse, just set them free for hours on grass. Certainly the older animals seem to get it worse, ponies are known for going laminitic on spring grasses. Many folks horses don’t have an issue THIS TIME, so they continue to think free turnout is “just fine”.
Talked to one of the local Vets, he is putting a ‘coliced on grass’, horse down almost daily. Problem has been going on a couple weeks now since grass took off growing. Getting plenty of Laminitus horse calls, with LOTS of “put the padding on hooves, call the Farrier and LOCK THE PASTURE GATE” advice, for trying to help the horses. Vet is running many hours each day for these PREVENTABLE cases.
We do the add 15 minutes addition plan. Horses get 3 days of each stretch of time, then add 15 minutes. Then 3 days of that time limit, add 15 minutes. I time it VERY closely, not allowing “extra” minutes on the grass. When they get up to an hour of grazing, I will then split the sessions, so they get an AM half hour, with a PM half hour. Then start adding 15 minutes to each of those sessions for 3 days at a time.
Horses still get PLENTY of grass, but not all at one time like grazing for two hours straight. In fact the horses see me coming to drive them in when time is up, lift their heads and start coming in! They are full on the one grazing session, glad to wait until several hours pass for the next turnout session.
Another suggestion is to feed hay before starting your grazing session, horse is partially full already, not so piggy on the grass. Then with full stomach at the end of short grazing time, quite willing to come in off the grass. Sure helps with the beginning 15 minute grazing sessions, as they start on turnout.
Don’t hurry, don’t speed up to longer sessions quickly. Horse body can’t adapt quickly, no matter how much you “wish for it”. Still takes TIME for body to adapt to grazing, at LEAST 3 weeks to have any kind of grass flora building up in the stomach to digest that grazing he is stuffing himself with.
Don’t let your horse become a statistic, permanently damaged by trying to hurry his pasture time, because YOU don’t want to invest the time to control his grazing. Lame horse is pretty useless, and a coliced horse is expensive to treat. Does NOT have to happen.