Egg Industry - March 2015 - 17
EggIndustry * 17 effects taking place and continuing even at low concentrations to drive toward complete elimination. Additional P release The logical question raised by this level of phytate destruction is that of potentially increased matrix values in order to benefit - through further diet cost reductions - from the additional P released compared to standard phytase dosing. However, experience to date has shown that it is not practically possible to guarantee the release of 0.20-0.25 percent AvP, for example, when feed ingredients (and thus diet phytate-P concentrations) vary. The P requirements of superdosed birds also may be higher due to factors such as the subsequent increase in growth rate and the use of P to re-phosphorylate the additional available inositol at a cellular level. Dr. Mike Bedford is research director at AB Vista www.WATTAgNet.com * March 2015 Optimised phytase Practical experience during the past two or so years has shown that the overall financial and performance benefits that come from phytase superdosing are only maximized when a standard mineral matrix is used. The focus should instead be on choosing a phytase capable of efficient and extensive phytate destruction to eliminate anti-nutrient effects and release inositol. This in itself is not straightforward, because the range of commercial phytase products available has grown considerably in recent years. Successful phytase superdosing therefore depends as much on making the right choices and buying decisions as it does on correct dosage and application. A better understanding of the factors and mechanisms that underpin the response in the bird, and the emerging role of inositol in delivering that response, therefore represents a key step in the journey toward achieving consistent superdosing results. EI
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