Todays, there are a significant number of inorganic phosphorus sources in the world.

Most natural sources of phosphate are unusable for birds and poultry, unless they are processed by heat. Although, it is unlikely that insoluble phosphate sources are used by birds and poultry. But their solubility doesn’t make this product can be used.

Experiments to assess biological availability are more complex because some items such as: first of all the need to assess the growth birds and poultry. Phosphorus in most phosphate can be used by birds and poultry, except soft phosphate.