Dodson & Horell Soya OilConditioning oil to promote coat shine and weight gain. Information Soya Oil is a calorie dense way to help your horse gain weight and condition. Around 75ml per day will help your horse develop a healthy, shiny coat, while feeding more is an ideal way to provide extra calories without adding bulk to your horses feed. Feeding Guidelines 200 400kg pony = up to 150ml per day. 400 600kg horse = up to 300ml per day.