Phosphorus (P) is an indispensable mineral for poultry, and a failure to supply satisfactory amount of this nutrient in bird s diet, leads to serious economic losses. Therefore, poultry nutritionists propose reasonable safety margin for this mineral in bird s feed. Limited resources of phosphate have been discovered and mined consistently. And ultimately, future generations will face problems in obtaining enough P to exist. Being the third most costly dietary constituent, one of the main pollutants in bird s excreta, P deserves exceptional concern in feed formulation to meet specific...