Figure 1: Raw material cost (excluding cost of enzymes) when increasing the dose of Quantum Blue phytase in the presence of Econase XT (xylanase) using either minerals only matrix or the full recommended matrix, adjusted to take account of the combination with Econase XT.
are realistic. The level of substrate is probably easiest to take into consideration when we are looking at releasing phosphorus from phytate, as it is easy to understand that you can’t release more phosphorus than the level of phytate-bound phosphorus in the diet. It is normal to assume that no more than 90% of phytate-P can be converted to ‘available P’ (defined as equivalent to P from MCP), even at high phytase doses of a product that is capable of finding and
breaking down most of the phytate to the last phosphate group. This means that for a nutrient release of 0.24 % avP (as expected from 2000 FTU/kg Quantum Blue) the level of phytate-P in the diet should be above 0.267 %, which is a realistic value for a typical UK broiler diet. For the non-phosphorus elements of the matrix the situation is different, as these depend not on the amount of phytate present but more on how fast the phytate concentration can be lowered and how low it can get. This means that extra-phosphoric benefits, translated into amino acid and energy matrix values, can be achieved even in lower phytate diets. A prime example are piglet diets which typically are around 0.15 % phytate-P, yet the benefits from using high levels of phytase on performance have been shown repeatedly. Whether there is room to take account of the expected nutrient
release values depends of course on any specific constraints being applied, such as fat minimum for product quality or minimum weighing quantities etc. It is always sensible to check for this sort of thing to avoid formulations ‘filling up’ with materials like limestone, there could be an opportunity to redesign diets to optimise efficient use of the additives and matrix values. In general, the use of appropriate matrix values should result in reduced feed costs and equal animal performance.
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