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Regarding Tenderness and Quality Grade - Information from Bovigen, the company that performs the GeneSTAR tests

Impacting Tenderness Fast. Tenderness is typically evaluated through the use of Warner-Bratzler Shear Force (WBSF) tests. Most commonly, WBSF scores are gathered in research environments, though increasingly producers are collecting samples on production animals as means of evaluating this carcass trait within their herds. Overall, collection of this data is a time consuming and expensive process, which makes it difficult to evaluate breeding stock at a young age for these traits.

Bovigen has gone through an Independent Validation with the National Beef Cattle Evaluation Consortium (NBCEC) for their entire Tenderness Panel (T1-Calpastatin, T2-Calpain 316 and T3-Calpain 4751). The combined effects of these markers account for about two and a half pounds of WBSF. On average, the T1 marker for Calpastatin accounts for about one pound of shear force and is completely independent of the other two markers currently making up the GeneSTAR Tenderness test. T2 and T3, both markers in the Calpain gene, also account for about one pound each, though they are not independent of each other. As a result they account for about one and a half pounds in total.

GeneStar® Tenderness Genetic Progeny Difference