houshang lotfollahian

Hi Prof Jarez, I think the authors can try to refit the graph (equation) by changing the x-axis to "Intake of supplemented Met" (rather than "% of supplemented Met). RBV can be based on actual intake of testing nutrients. I wish you are well! -Best, Sung Woo

Hello there. Based on my personal experience with phytase, beside considering phytase nPP equivalency (the value depend upon phytase origin and level), one should be very careful in considering phytase matrix value (for other nutrients such as amino acid, Ca, etc.) in practical diet formulation.

Mohammad Hosein Shahir I agree with this position especially in rations where phytase is not added

I think you should use calcium matrix value of phytase, otherwise, calcium to phosphorus imbalance (the ratio more than 2) occurs.

Dear Rami Unfortunately still many of the nutrients in feed specification for poultry is crude, like CP , CF , EE and of course Ca. Ca is usually over supplied to the poultry diet from many sources like: Drinking water (as a rule of thumb poultry take water twice the feed intake) , Carrier in premix , concentrate , pro-prebiotics also as anti-caking agent in SBM. For example when you add 1 kg ...