Fred

I agree with you and never forget the matrix for sodium because sodium excess can affect kidney performance but I don't consider the phytase matrix for amino acids because it is not really clear how much amino acids can be bonded to phytase and, on the other hand, if you add 0.02 % more amino acids it is not harmful.However, if you don't consider calcium in matrix of phytase, the ratio of ca/p can ...

Ali Afsar I recognize quite a bit of that text...

Aaron Cowieson Ha ha! :-) He did at least put in a reference to you.

In my viewpoint, you need to consider matrix value of Ca as well; otherwise, and as mentioned by others, Ca level in your diets incased that has adverse effect on Phytase. Below I added some considerations regarding Phytase and its matrix value. I hope this would be applicable. Factors affecting phytase activity Mineral contentAlthough doubted in some literature, high level of dietary calcium has ...

A couple of quick remarks on this topic. When phytic acid is hydrolysed by phytase and the mucosal phosphatases in the intestine the only two direct products of this are myo-inositol and phosphate. We have measured the appearance of both of these in multiple experiments and this is clear evidence of phytase efficacy and its compatibility with endogenous phosphatases in the intestine. All additiona ...

Well, interesting, but I am not so optimistic: as I am from the country of limestone - Italy - I well know how large the variation in Ca digestibility can be among various geological origins of limestone, even without mentioning the particle size issue...The other question of giving Phytase a Ca value or not, in my experience when many years ago in Europe we started to give a Ca value to Natuphos ...

Dear All,formulating in Bestmix, I also considered the total Ca and dig./av. P for the added phytase; and energy (ME) and AA for the NSP enzymes only. On this way I estimated to be on the safe side, because the nutrient matrix values indicate the amount of nutrient that could be released when the enzyme is added.In the past 10 years it became a trend to request and offer “matrix values&rdquo ...

What many nutritionists do in LCF, is to create 2 nutrients for calcium. One might simply have the name calcium and would include the total amount of calcium in the ingredients plus the value assigned in the phytase matrix. To this nutrient it would be assigned the min and max restrictions and it would be used to calculate the Ca.avP ratio (which could receive the restrictions instead of calcium). ...

In order to assign a calcium value to a phytase it has to be done in the equation for digestible calcium (Ca dig) together with the Ca dig values of the other ingredients as phytase does not supply Ca tot per se.