Mike Tokach: "The amount of phytase used in pigs has been increasing"

Published on: 03/15/2017
Author/s : Carlos Avilan (Engormix). Interview with Dr. Mike Tokach, Professor and Extension Specialist, Kansas State University, Department of Animal Sciences & Industry.

Q: What have been the most interesting findings in your latest researches on minerals? A: I will break it down into a couple of major areas. Recently, we've done a lot of work on calcium and phosphorus, in terms of major minerals, and also with sodium and chloride levels. First on the calcium and phosphorus: in terms of phosphorus requirements, what we are finding is that the pigs in the fiel...

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Re: Mike Tokach: "The amount of phytase used in pigs has been increasing"
15/03/2017 | Thanks Mike for this interview and very interesting answers on this topic. Since you mention phytases within the responses, would you be so kind as to give an opinion on what are your thoughts on three topics: i) high dosages of phytase, effect beyond P and other minerals release/availability; ii) high ZnO dosages, how do you think they would interfere with phytase, what your recommendation would be?; iii) would you say phytases must have a different response depending on the phytate origin?, is there good and solid information out there in this subject?. Many many thanks from Madrid, Rafa.
Re: Mike Tokach: "The amount of phytase used in pigs has been increasing"
16/03/2017 |

High doses of phytase have shown benefits in several experiments with nursery pigs. While I believe that some of the benefit is due to release of other nutrients, I also believe that pigs were under their phosphorus requirements in many of these studies. Thus, providing high doses of phytase allows maximum phosphorus release. Thus, there is good evidence that we should consider high doses, especially with young pigs.

Although the data on interactions between zinc oxide and phytase is not entirely clear, I would recommend adding more phytase to the diet and formulating to higher P levels when pharmacological levels of zinc oxide are included in the diet.

On your third question, I am not the best person to answer this question. I initially read your question as phytase origin, but you are asking about the phytate origin. There is some evidence from poultry that phytate origin may have an impact on phytase ability to release P, but the data is very limited and I am not aware of data on the subject in pigs.

Mike.

Re: Mike Tokach: "The amount of phytase used in pigs has been increasing"
16/03/2017 | Mike, many thanks for taking your time answering my questions. All clear. Rafa from Madrid!
Zdzislaw Mroz
Veterinary Doctor
Re: Mike Tokach: "The amount of phytase used in pigs has been increasing"
28/03/2017 | Dear Mike,
You replied to Rafael Duran that you are not aware of data concerning extrinsic/intrinsic phyteses and the origin of phytate in pigs. I suggest to get more insight in the work of Mroz, Kemme and Jongbloed from Lelystad with regard to this topic.
It is obvious that from the commercial point of view - the higher doses of supplemental phytase the better income of the manufacturer. However, from the scientific point of view, we should inform the readers objectively that the effect of extrinsic phytases in the diet is closely interrelated with the level of intrinsic phytases.
With friendly regards.
Prof. Zdzislaw Mroz from Lelystad
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