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This member gave a presentation on January 27, 2020
At the following event:
IPPE - International Production & Processing Expo 2020
Participation in Forum on November 4, 2019
For sure enzyme responses are non-linear but in the range, we test them in animal nutrition they occasionally appear linear. I think it is crucial to also examine available/reactive substrate concentration when interpreting enzyme response. Systems may be saturated with the substrate in which case enzyme responses may be exaggerated across a wide range of inclusion concentrations, or they may be s ...
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Participation in Forum on October 17, 2019
Park W. Waldroup I think FTU, in a generic sense, is largely meaningless from a biological effect perspective but provides a moderately useful index against which phytases can be traded and registered with the appropriate authorities. From the perspective of the animal though, FTU (which is typically measured with substrate, cation, pH etc conditions of limited practical relevance), is poorly corr ...
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Participation in Forum on October 31, 2018
Hi Meg, all useful comments and I agree with most of your points regarding the characteristics of phytases that promote bioefficacy. However, I don't think the title of this video is reflected in the comments that you have made. I've noticed this with several other Engormix videos also. The title should reflect the content of the video. The title here was - 'The key to using phytase in effecti ...
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Participation in Forum on September 20, 2018
Henk Ghesquiere It is theoretically possible to overdose xylanase but in practice, I think this is unlikely to be a significant issue with most xylanases that are available commercially. Firstly, most commercial xylanases are endo-acting and so do not produce appreciable quantities of free xylose or arabinose (which are known to have a net negative energy value for animals as they are readily abso ...
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Participation in Forum on September 5, 2018
Mike Bedford Interesting stuff. Look forward to seeing the caecal sieve info! One thing I can say with some certainty is that the effect of xylanase (and perhaps NSPases in general) appears to be really highly generic i.e. the mechanisms of benefit, whatever they may be, do not seem to favour some nutrients more than others. If you think back to the analysis we published on ileal amino acid digest ...
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Participation in Forum on August 29, 2018
Interesting. It seems perfectly logical to me that if you change the substrate flow into the caudal gut (by increasing the rate of digestion of e.g. starch and protein or altering the solubility or tertiary structure of NSP) the microbiome will rapidly adapt to this new ecology and reorient itself accordingly. However, I find it a little difficult to accept that the major mechanism of a xylanase o ...
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Participation in Forum on May 17, 2018
Dimcho Djouvinov Actually in our work we have shown that this is not the case. In a large meta-analysis of more than 60 broiler performance trials we saw no deterioration in protease efficacy at all whether phytase was present in the diet or not. In fact, the right protease can improve access to phytate for phytases by degradation of the phytate protein globoids and may help with amino acid avai ...
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Participation in Forum on May 17, 2018
The more divalent cations in the diet the less soluble phytate becomes. This is especially true when drinking water pH is high and when phytate concentration is also high. In diets with high concentrations of e.g. Ca (from limestone, drinking water Ca, inorganic P sources, vegetable sources, V&M premix etc), high phytate concentration and more alkaline drinking water then the need for superdosin ...
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This member gave a presentation on January 30, 2018
At the following event:
IPPE - International Production & Processing Expo 2018
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Location:Orkney, Orkney, United Kingdom
Profile: Academic / scientific
Occupation: Research
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