The farm’s selection criteria are notoriously rigorous. To be inducted into the MBS stallion roster, a horse must demonstrate:
"The MBS Series farm is the only place I trust for frozen semen. We imported 'Valhalla' straws to Germany, and our mare delivered a healthy filly with perfect conformation." — Anna L., Lower Saxony mbs series stallion breeding farm
The "Series" in the farm’s name refers to their innovative Grading System for foals. When a foal is born at MBS (or sired by an MBS stallion elsewhere), it receives a "Series Score" from 1 to 5. The farm’s selection criteria are notoriously rigorous