The team, writing in Livestock Science, documented how the incorporation of phytase in pig feed improved bone mineralization, while adding formic acid to the ration improved growth, FCR and the apparent total tract digestibility (ATTD) of magnesium, iron and calcium.
However, even though the formic acid addition reduced stomach pH, no interaction between phytase efficacy and acidification was seen, found the researchers.
Hypothesis for research
Phosphorus (P) from plant sources in pig diets occurs primarily in the form of phytate, and the pig has a limited ability to degrade phytate. To reduce the amount of P in feces and hence environmental pollution, exogenous phytase is routinely added to pig diets. However, phytase does not degrade the phytate completely.
The authors said that many minerals like calcium (Ca), zinc (Zn), iron (Fe), copper (Cu) and magnesium (Mg) are bound to phytate in mineral-phytate complexes. This reduces the phytate degradation, thus decreasing both mineral digestibility and phytate-P availability (Maenz et al., 1999).
The effect of phytase addition on mineral digestibility is not consistent, they noted. Arredondo et al. (2019) found an increased apparent total tract digestibility (ATTD) of Mg and Zn with phytase addition, but no improvement in ATTD of Cu, Fe and Mn.
The affinity of the minerals to phytate is dependent on pH level, and organic acids are expected to increase mineral absorption by lowering stomach pH and reducing the binding of these minerals to phytate in addition to the increased phytase efficacy by lowered pH (Jongbloed et al., 2000), said the Norwegian team.
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June 24, 2021 at 10:05PM
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Feed acidification would appear not to increase phytase efficacy - FeedNavigator.com
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