60% fat for rapid weight gain Probiotics Yeast Culture Impoves skin and coat condition Apple Flavored - Meal Form! Pro-Weight is an effective nutritional aid which provides dense fat and live, stabilized microbials (probiotics) to supplement for weight gain, body condition, and fuel for performance. Pro-Weight contains 60% fat from flax meal, soy meal and vegetable fat.* (Adding a fat supplement to horse feed will increase the digestibility of the entire ration.)