In vitro-based research suggests that the use of organic trace minerals can better spare phytase activity when compared to inorganic equivalents.
While the jury may still be out on the actual commercial benefits of superdosing, some published literature does suggest corresponding improvements in feed conversion ratio (FCR) and/or apparent metabolizable energy when phytase is supplemented at higher than recommended rates. Phytase activity does not respond in a linear fashion; doubling the phytase dose will not result in a doubling of enzyme efficacy. In fact, the numbers indicate that doubling a standard 500 FTU/kg dose will only result in a 30 percent increase in phytase efficacy, and doubling that dose again will halve that efficacy rate. So, if enzyme performance doesn’t necessarily go hand in hand with the amount of enzyme added, are there other limiting factors in the feed that are hindering phytase efficacy?