Different sources of phosphates

What is the difference between monocalcium phosphate and dicalcium phosphate?
Modern, 21st century feed production has countless options for adding nutrients; polypeptides with phytase activity, inorganic copper chelates, or polynucleotide sequences, to name a few. But the feed producer’s weaponry still holds a place for older, low-tech nutrition: phosphate feed additives. Today, dicalcium and monocalcium phosphate are still popular choices for feed supplementation, just as they were when they were first developed over sixty years ago.