Managing Horses on Lush Grass After Rain: Supporting Gut Health During the Autumn Flush

After a long, hot and unusually dry summer, the recent rainfall is very welcome. However, for horse owners, the sudden return of lush grass after rain can bring a new set of nutritional and digestive challenges.

Pastures that have looked scorched, yellow and dormant can recover remarkably quickly once rain returns. Combine moisture with warm soil temperatures and grass can suddenly spring back into life, creating the ‘autumn flush’ of fresh growth.

For horses and ponies, this can mean a surprisingly rapid change in diet – making careful grazing and digestive management particularly important.

From Dry Summer Pasture to Lush Autumn Grass

Dry, stressed pasture isn't necessarily nutritionally harmless. During sunny conditions when plant growth is restricted, grasses can accumulate non-structural carbohydrates (NSC), including sugars.

This is particularly important for horses and ponies with Equine Metabolic Syndrome (EMS), insulin dysregulation or a history of laminitis, where careful management of grass intake may already be necessary.

Following rainfall, rapidly growing pasture can change both the amount and type of forage being consumed. Horses may also considerably increase their grass intake as fresh pasture becomes more palatable.

Importantly, it isn't only the horse that has to adapt – the gut microbiome does too.
The equine hindgut contains a complex population of microorganisms responsible for fermenting fibre and helping the horse extract energy from its diet. Sudden changes in forage can alter the nutrients reaching these microbes and disrupt the balance of the hindgut environment.

Five Tips for Managing the Autumn Grass Flush

1. Be prepared
   Consider how rapidly improving pasture could affect your individual horse. Strip grazing, electric fencing, grazing muzzles or restricted turnout may be useful where grass intake needs controlling.
2. Monitor weight and body condition
   Fresh pasture can provide a surprising amount of energy. Regularly monitor your horse's weight and body condition so that unwanted gains are identified early.
3. Take extra care with laminitis-prone horses
   Horses with EMS, insulin dysregulation or a previous history of laminitis require particularly careful pasture management. Don't wait for visible weight gain before reviewing their grazing.
4. Review the whole diet
   More grass means more calories. Concentrate feed may therefore need reducing. Conversely, horses on restricted grazing still require adequate appropriate forage alongside a balanced supply of essential vitamins and minerals.
5. Support digestive health during dietary change
   Periods of changing pasture are an important time to support the digestive system. Maintain adequate fibre intake, avoid abrupt feed changes wherever possible and consider targeted digestive support for horses to help maintain a stable stomach and hindgut environment.

Plusvital Neutragast provides nutritional support for both the stomach and hindgut. Its combination of marine-derived minerals, glutamine, threonine, live yeast and MOS helps support gastric comfort, beneficial hindgut microbes and a healthy digestive environment – making it particularly useful during periods of dietary and management change.

The return of green grass is certainly something to welcome. With a little forward planning, your horse can enjoy the autumn flush while keeping weight, metabolic health and digestive function firmly on track.

Need help with your horse's diet?

Every horse is different. If you're unsure how to adjust your horse's feeding or grazing as pasture conditions change, contact Rebecca, Plusvital's Equine Nutritionist, for practical nutritional advice and support.