Functional chicken eggs※1(internationally patented) are produced by feeding tamogi mushrooms to chickens. Ergothioneine, a rare and useful substance for living organisms, is bioaccumulated in the eggs , resulting in eggs with different properties from other eggs
In the old days, Japanese farmers used to let their chickens roam free in their gardens. When chickens were allowed to roam free, they constantly dug around in the ground to find insects and plants to eat . Mushrooms contain high levels of
ergothioneine, bu t edible mushrooms are rare. If you have ever gone mushroom hunting in the wild, you have probably noticed that you often see mushrooms that have been eaten by insects. Mushrooms grow almost everywhere. Insects eat these mushrooms, which in turn are eaten by hens, and it is thought that ergothioneine was concentrated in the eggs in the past through the food chain. Modern chicken formula feeds contain only trace amounts of ergothioneine or no ergothioneine , so ergothioneine is not detected in many eggs produ ced on common feeds.
Metabolome analysis*2 was performed on eggs fed a common feed and on eggs fed a common feed plus tamogitake mushroom.
The results showed that only functional chicken eggs contained ergothioneine and NADH (sold as a dietary supplement), which were not detected in ordinary chicken eggs. In addition, the content of several useful substances, such as GABA (sold as a dietary supplement), was increased.
|Substance containing chicken eggs||electrophoresis apparatus||Time-of-flight mass spectrometer|
|common chicken egg||functional chicken egg||area ratio|
|nicotinamide adenine dinucleotide hydrazide||664.12||8.130||non-detection||1.6E-05||－|
|gamma-aminobutyric acid (GABA)||104.07||8.516||1.6E-04||2.9E-04||1.8|
On the other hand, the following three odor causing substances have not been detected in functional chicken eggs.
Butyric acid/Isobutylic acid
This makes functional chicken eggs superior to other eggs in terms of palatability.