Emerald Green Grass Carrot Tasty Treats. Carrot, a firm favourite with horses and ponies of all shapes and sizes, combined with either our Grass or Alfalfa Pellets, is a great way to provide some all important Vitamin A for your horse s diet. Vitamin A is a powerful antioxidant and as such significantly contributes to horse s health and well-being. Carrots are also a source of important minerals such as potassium, copper and manganese.