This Book is relevant to livestock farmers in Nigeria and other tropical areas particularly those with semi-arid climatic conditions. For a long time; Farmers, Teachers, Researchers and other stake holders in Agriculture (especially in Nigeria and other tropical areas of Africa) depended entirely on the nutrient requirements of animals in the temperate regions which is available in the literature. This write up focused on the nutrient requirements (Energy and Protein) of Animals (Sheep) in tropical areas such as Nigeria.The nutrient requirements of animals reported in this book will be particularly useful for Livestock farmers, Students, Teachers and Researchers especially in semi-arid areas of Africa who intended to raise animals for one purpose or another. The book will also serve as a guide for developing nutrient requirements for various species of animals in tropical areas of the world.