World’s sheep and goat flocks are raised mostly under harsh environments where feed shortage is the main constraint to their production development. The available feed resources are often low in energy and digestible proteins, and fail in most cases to cover livestock maintenance requirements. They can be better used by the animal if the rumen ecosystem for fermentative digestion can be balanced by supplying deficient nutrients mainly energy and nitrogen (Leng, 1990). In drought conditions, farmers are obliged to use high amounts of concentrate feeds to mach nutrient demands of stall-fed and free grazing animals. The high cost as associated to limited and seasonal availability of these supplements hamper, à priori, their wide scale use, especially by small farmers. Feed blocks seem to be an attractive alternative to overcome this situation. This paper addresses a review on the potential use of feed blocks in sheep and goat feeding