The purpose of trademark registration is to protect the rights and interests of trademark owners, so as to ensure their exclusive use of trademarks in specific areas. Where a trademark has been registered, the use of the same or similar trademark by others in the same or similar category may constitute infringement.
According to the information you provided, the original Mu brand selenium-enriched grass egg has been registered as a trademark, while the unregistered selenium-enriched ecological egg is an unregistered trademark. In this case, if two trademarks are used to sell similar products or services of the same or similar categories, the use of "unregistered selenium-enriched ecological eggs" may constitute trademark infringement.
The determination of trademark infringement needs to consider many factors such as the similarity of trademarks, the similarity of products or services, the degree of market confusion and so on. In addition, different countries or regions may have different provisions on trademark infringement.
If you think your trademark right has been infringed, I suggest you consult a professional intellectual property lawyer, who can provide more accurate legal advice and guidance according to the specific situation.
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