NAF GastriAid. NAF GastriAid has been developed to naturally support the absence of ulcers in the stomach. NAF GastriAid contains natural antacids to help defend the stomach wall from acid build up and pre and probiotics help to maintain the pH balance in the gut. NAF GastriAid provides daily protection from stress related gastric problems and ulcers. NAF GastriAid should be split between feeds throughout the day Add to a small chaff based pre- exercise feed. Horses and Ponies Daily Recommended Amounts Horses Loading Rate (3-10days) - 120g per day = 6 scoops per day Maintenance Rate - 60g per day = 3 scoops per day Ponies Loading Rate (3-10days) - 80g per day = 4 scoops per day Maintenance Rate - 40g per day = 2 scoops per day A 1. Read more…8kg tub fed at Horses Maintenance Rate of 60g per day will last approximately 30 days. A 3. 6kg tub fed at Horses Maintenance Rate of 60g per day will last approximately 60 days.