NAF Five Star Oestress. NAF Five Star Oestress is a unique complex of herbs that can help to balance her oestrus cycle by targeting the root of her discomfort that causes the 'moody mare'. Oestress allows the mare to naturally correct her hormonal imbalance making her more inclined to relax and concentrate on her work. Oestress offers bio-available magnesium to help support the system against the anxiety and muscle tension often seen in hormonal mares and is rich in antioxidants. Oestress should be fed daily throughout the spring and summer season and may be increased in accordance with the mare's oestrus cycle. Read more… Can be fed all year round if needed. NAF Five Star Oestress is also suitable for geldings displaying 'riggy' behaviour. Horses and Ponies Recommended Daily Amounts Loading Rate (7-10 days) - 30g per day = 3 scoops Maintenance Rate - 10-20g per day = 1-2 scoops 500g fed at maintenance rate should last approximately 50 days. 1kg fed at maintenance rate should last approximately 100 days.