The vit will publish official breeding values of direct health traits for the Holstein and Red Holstein breed for the first time during the breeding value estimation April 2019. We would like to introduce the RZudderfit today.

The health trait Mastitis is incorporated in the RZudderfit by 100 %. The definition of Mastitis is clear and a high number of cows contracts Mastitis at least once in their lifetime. Moreover, heredity is good and udder diseases are also a culling reason why the data set and, therefore, reliability of this genomic breeding value are good.

Comparing the well-known breeding value for cell count (RZS) with the RZudderfit shows that cell count is a good indicator trait for Mastitis resistance, but the RZS is a somewhat different trait.