Do phytases always work in poultry nutrition?

Just reacting to the original question (do phytases always work in poultry nutrition). Clearly this depends on how you define 'work' i.e. what the expectations you have of the phytase. It would be possible, for example, to manufacture a situation where the efficacy of the added phytase looked very poor e.g. if the diet to which you add the phytase has a high concentration of digestible phosphorus (above the animals requirement), or a very low concentration of phytic acid, or has a digestible SAA limit or where the phytase has been added inappropriately (perhaps a heat labile product was added pre-pelleting and the conditioner temperature, steam pressure and residence time were high) etc. However, when high quality phytase products (gastric stable, appropriate pH range, stable product form, good particle size and distribution through the feed etc) are added with the appropriate adjustments to diet composition (including Ca and P in particular) I think we can safely say that yes, phytases always work in poultry nutrition. In fact, phytases save the global feed industry in the region of $5-6bn per annum through reducing nutritional input costs, not to mention the added benefits on animal performance and environmental sustainability.

The phytases work in an excellent way in poultry nutrition. We need to remember the balance of the phosphates and calcium to increase the absorption of the nutrients in any formulation. I use the phytases in the formulas and I can see serious changes in the performance of the birds. Remember the live period of the birds and the genetics, we need to have all this aspects in mind, and give the best quality feed and reduce the stress to our bird, don't expect to have big results with a poor formulation.

It works very well, depends on many factors of which the dose and type of phytase and Ca and Phosphorus and Ca/ P ratio

Really very informative data shared.
I would like to add some points about Ideal Phytase
Based on PPS
P-pH profile
Important to be highly effective in low pH.
Important to be effective at broad range of pH (1-5) range
P-Pepsin
Pepsin Resistant
Important to be resistance to pepsin to avoid the loss of activity in vivo.
S-Speed
Important to have fast working phytase because feed passage time in proximal gut is very less, so to release more and more phytate with the high speed.
Regards,
Dr Sachin Patil,India
M.V.Sc