Bio-Efficacy of Feed Proteases in Poultry and their Interaction with other Feed Enzymes

Published on: 12/16/2013
Author/s : Luis Romero and Peter Plumstead (Danisco Animal Nutrition, DuPont Industrial Biosciences, Marlborough UK)

I. INTRODUCTION The use of exogenous proteases in poultry feed has become more prevalent in recent years, following the broader commercial acceptance of other feed enzymes like phytases and xylanases, and increased pressure on the cost of proteinaceous ingredients. Most current commercial proteases for animal feed are alkaline proteases of bacterial origin. Feed cost is reduced with the inclusio...

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Tariq Mushtaq Tariq Mushtaq
Specialist in Animal Nutrition
December 16, 2013
Very good review. However, it focused more on Axtra XAP rather proteases per se.
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December 16, 2013
Hello there Luis and Peter. Many thanks for such a reviwe, with, in my opinion, very interesting insights in the role of proteases together with NSPases. At the end of the day this is what in commercial conditions most of poultry producers would do. Proteases alone are showing an effect but the combined effect is what matters at the end. As said, many thanks for very good review and keep the good work. From a cold but sunny Spain, Rafa.
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Tariq Mushtaq Tariq Mushtaq
Specialist in Animal Nutrition
December 16, 2013
Good to see the comments of Rafael. There is much more to be done on proteases. As discussed in review, this is not a straight forward like phytases. There are many proteases, variation in units and unit definitions, synergistic and antagonistic effects of different proteases, different optimum pH, feed buffering effects and many more. We need make it simple for the users/nutritionist. Keeping confused values for different amino acid digestibility and matrix values may shake the confidence of the user despite its un-match effects.
I agree that we should start with very conservative approach in term of digestibility values.
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December 17, 2013
Nice review. Wonder how it goes with phytase?
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