Juliet M. Getty, PhD, provides guidance on fresh grass and the potential problems it can cause for horses. She continues with tips on monitoring grasses throughout the season.
Source: Equine Wellness, April 15, 2014. Link. Tasty spring grasses can offer too much sugar and starch for the insulin resistant horse, thereby increasing the risk of laminitis. However, with careful monitoring of climate conditions, many of these horses can enjoy the benefits of pasture grazing. Periodic testing is worth considering; it will give you more information and take much of the guesswork out of your decision-making.