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Natural feed additives based on plants are more and more used in animal nutrition.
Their active compounds, like grape polyphenols, represent a powerful source of antioxidant.
However, doubts remain about their stability in the rumen.
To clarify that issue, an in vitro trial was carried out to assess the effect of the rumen flora
on the stability of a standardized grape extract.
Rumen fluid was mixed with a grape extract and fermented for up to 24 hours.
We then added formic acid to the mixture and proceeded – after several manipulations – to an HPLC Analysis.
This graph shows the significant and progressive decrease of the phytomarkers.
77% of them are degraded after just 1h, and they disappear after 24 hrs.
As we can see, grape extracts molecules are highly sensitive to the rumen fluid activity.
This raises the issue of powdered grape extracts stability in the rumen & this issue may also concern every natural antioxidant additive.
A protection of the grape extract feed additive is therefore necessary.
These results need to be completed by other trials to extend these observations, especially on the animal.
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