ISSUE FOCUS 30 FEED & ADDITIVE MAGAZINE November 2022 The same is also true for Delacon's Swine PFA – Aromex Pro. Several scientific and field trials have shown that adding Delacon's PFA into a growing and finishing diet improves performance, such as feed efficiency. Figure 2 shows how the ileal digestibility of nutrients can improve when the Delacon PFA is fed to pigs. THE NEW WAY, MATHEMATICAL MODELLING Based on previous performance trial results and diet formulations, mathematical modelling can be used to validate the digestibility effects of a given feed additive used. A non-invasive method, like mathematical modelling, can be used to calculate digestibility (Moore-Colyer et al., 2003). Furthermore, when considering all aspects of this method, a large amount of data from multiple performance trials can be used within the model - as you can use historical data to the present day. The model can account for diet nutritional content/values, age, breed, and trial length. Therefore, establishing a correlation between nutrient intake and the animal's performance and then applying that regression to the improved performance of the animals fed the PFA will provide a theoretical value for intake required for the improved performance result. This is the basis of the nutritional matrix value calculation. Delacon undertook the 'mathematical modelling' technique to validate the digestibility and performance results observed from previous studies. The analysis included an impressive 81 broiler trials (from 2002 to 2022). Diet formulation, performance results, age, and breed were some of the critical inputs required for the model. The initial results seem to validate the already existing Performizer solution values obtained from the classic digestibility trials. The next step is to do the same validation in swine, and if similar results are achieved, this may be a promising approach to use in the future. Figure 1. Differences in ileal digestibility crude protein PFA and Control in poultry (internal data) Figure 2: PFA effect on the apparent ileal digestibility of nutrients, measured in pigs of 50 kg (internal data)
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