Accurate calculation of phosphorus allowances to closely match animals’ particular nutritional requirements is vital from both a nutritional and an environmental standpoint. In order to enable feed compounders to make this calculation, the chemical composition the feed phosphate and its purity must be assured.

However, not all products on the market today are of a known chemical composition or of sufficient quality to guarantee a regular supply of digestible phosphorus. Furthermore, these products have often been found to contain high levels of impurities, which can be harmful to the animal.

Investment in state-of-the-art production processes by members of CEFIC’s Inorganic Feed Phosphates Sector Group enables them to manufacture products in Europe that are entirely predictable in their phosphorus content and digestibility, as well as in their purity. These phosphates are sold with the Quality Feed Phosphates® symbol.

Feed phosphate solubility

   

Solubility of P

 

Total P content (%)

in citric acid

in ammonium citrate

Monosodium phosphate

20-24

Disodium phosphate

9

Monoammonium phosphate

27

Monocalcium phosphate

22.7

Na Ca Mg phosphate

17

Monodicalcium phosphate

21

Dicalcium phosphate

17-21

Defluorinated phosphate

18

o

Tricalcium phosphate

20

o

o

Natural tricalcium phosphate

14

o

o

Calcium metaphosphate

20

o

o

Calcium pyrophosphate

24

o

o

• > 95% solubility - o < 95% solubility

Methods of analysis

Quality feed phosphates are regularly analysed using standardised laboratory methods to determine their phosphorus and calcium content, their solubility in citric acid and ammonium citrate (which should be above 95%), and impurities such as arsenic, cadmium, lead, fluorine and mercury. The test methods are given in the back pocket of this publication.

Products carrying the Quality Feed Phosphates® symbol are guaranteed to be of a high quality and nutritional value and meet all EU regulations regarding impurities. The continuing right to use the symbol is backed by a random sampling- and testing procedure that ensures that the feed phosphates comply with the relevant standards.

The table gives an analysis from several independent laboratories of the phosphorus content and relative solubility of some typical feed phosphates. All the samples were analysed according to the same methodology and the results show the differences between mono and dicalcium phosphate and the tricalcium form.