Foreign meat identification by DNA breed assignment for the Chinese market

Area of Science:

• Animal genetics
• Livestock breeding
• Food authenticity

Background:

• Breed identification is crucial for detecting commercial fraud in the beef industry.
• Chinese Yellow Cattle (CYC) require specific identification methods to prevent mislabeling.
• Microsatellite markers are valuable tools for livestock genetic analysis.

Purpose of the Study:

• To develop and validate a microsatellite-based DNA test for identifying Chinese Yellow Cattle (CYC).
• To differentiate CYC from other Bos taurus and Bos indicus breeds.
• To assess the test's efficacy in detecting commercial fraud and verifying beef origin.

Main Methods:

• Genotyping of CYC and reference breeds using 22 microsatellite markers.
• Development of an allocation test for breed identification.
• Independent validation of the test using meat samples of unknown origin from Argentina.

Main Results:

• The developed test successfully discriminated most foreign breeds from CYC.
• Some CYC individuals were misallocated due to recent breed introductions (Limousin, Holstein).
• An independent test allocated 92% of Argentinean samples to Angus, Hereford, or their crossbreeds, with no CYC identification.

Conclusions:

• The microsatellite-based test is a reliable tool for certifying foreign beef origin.
• The test can effectively detect adulteration of CYC beef misrepresented as imported meat.
• Further confirmation is needed for the observed Zebu cline and potential B. taurus structure within CYC.