Phytase matrices are derived through the amalgamation of bone ash, growth and balance/digestibility studies using methods that can result in inappropriate safety margins that expose the user to potential risks in the field.
Phytases entered commercial use in the early 1990s and are now widely included in monogastric diets. However, phosphorus (P) replacement values determined by controlled trials are not always replicated in the field, and feed manufacturers have become wary of recommendations, often reducing the P matrix value applied to the phytase.
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