When compared to alfalfa hay, oat hay is lower in crude protein as well as in digestible energy. The nutritional value of oat hay may be increased by using a variety of forage species that are known to have higher nutrient levels than oat grass, such as alfalfa. Forage selection is based on the needs of the animal at the time of year when the hay is being fed. For example, hay that is suitable for use in winter should contain more protein and digestible energy than hay that is fed during summer months. Alfalfa hay can be grown from late spring through mid-summer, whereas oats must be planted in early spring and harvested in the fall. Oats are most commonly grown for winter feeding, but may also be fed in the summer if the forage is cut and stored prior to use.