A2A2 sires increase the prevalence of A2 milk on your dairy.

Beta-casein gene influences production of milk protein casein which has Aq & A2 variants

  • A2 milk is potentially linked to health benefits associated with:
    • Autoimmune disease
    • Heart disease
    • Type 1 Diabetes
    • Neurological Impairment on Autism & Schizophrenia


A single gene controls beta-casein production

Herds can convert to 100% A2 milk within 4 years using intensive selection.

Health benefits are still being debated in the research community

A2 milk is selling at a premium

A2 variant is becoming more common in Holstein sires >2500 GTPI