HOW the individual horse is affected depends on the interplay between the changes in nutrient composition of the grass over the previous few days and the nutritional/metabolic status of the individual horse at the time...

For serious issues like laminitis, head-shaking/flicking our advice would be NOT to let him back out on ANY green vegetative grass. ‘Keeping an eye on them’ is a very risky strategy.

Sodium has several major roles including that of delivering nutrients into cells also for ridding the body of nitrates.

Unsuitable pasture will cause metabolic (health, movement and/or behaviour) issues in any horse.

IF you are thinking about resowing your pastures, thoroughly consider the following information because it is not as simple as it seems and will not be the solution to all your problems because even ‘Horse Friendly’ grasses need to be at a mature stage of growth before grazing.

Red clover can cause 'stallion-like' behaviour in geldings. The first line of thinking when such behaviour shows up is that the horse hasn't been gelded properly.

Because excess iron cannot be excreted, there is concern that many horses suffer from iron over-load.

Of course CHH would advocate that grass-free options (not just yards or stables) need to be standard facilities when charging for grazing.