Solubility of minerals is the primary factor for their absorption and utilization in animal's body. It is a complicated process affected by many factors like type of mineral, localization of minerals in plant cell, degree of solubility in water, rumen fluid pH, concentration of the minerals in the rumen, type and quality of roughage and roughage to concentrate (R/C) ratios in diets incubation period. This book will be useful for animal nutritionist and animal and veterinary science students.