Select the phytase variety with the best phosphorus release rate; try to use feed ingredients with rich phosphorus content; use phytase in excess dose (6-12 times) in low-phosphorus diets; adjust hydrogen according to the calcium and phosphorus needs of different animal diets Calcium dosage (for medium and large pigs, hydrogen calcium is replaced 1-2 months before slaughtering with high phytate phosphorus; for medium and large ducks, hydrogen calcium is not added or slightly supplemented with high available phosphorus (3 kg); low-protein broiler feeds meet the minimum phosphorus requirements Calcium without hydrogenation is required).
The phosphorus release efficiency of phytase from different sources (0.5 U/g): 26.95-36.13% phosphorus release from broiler feed, 58.41-73.51% from rice bran, and 67.73-74.77% from corn and soybean meal. The phosphorus release is increased by 5%. Calculated based on 0.3% phytate phosphorus in the formula, 0.015% more effective phosphorus can be released, which is equivalent to 1 kg of DCP.
In commercial feeds, by adding phytase, calcium hydrogen phosphate can be reduced or even eliminated.
Adding 0.5-2 U/g phytase to the duck feed that has been overdose added phytase can also increase the available phosphorus by 1-3%; for broiler feed, it can also improve the phytase by 3-7%. Available phosphorus; as high as 18.52% for laying hen feed; as high as 29.55% for pig feed. Adding phytase in excess dose can release 0.02%-0.06% more available phosphorus, which is equivalent to a profit of 3.9-11.6 yuan.