Interesting article and analysis about the USA A2 Market.  Based on this and looking at AU/NZ/China history I think the US dairy industry is on a siilar tracjectory to AU, i.e. initial resistance and a slow initial move away from A1 then  an exponential growth towards A2 herds, followed by a widespread scramble to get  A2 herds

http://www.digitaljournal.com/pr/4162993?noredir=1

A2 Milk Market Revenue to Increase at a 10.2% CAGR over 2018-2028, Driven by Growing Prevalence of Digestion Related Conditions - TMR

A2 Milk Market - Global Industry Analysis, Size, Share, Growth, Trends, and Forecast 2018 - 2028

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Albany, NY -- (SBWIRE) -- 02/16/2019 -- Transparency Market Research presents brief insights into the global a2 milk market, in its upcoming market report titled, 'A2 Milk Market: Global Industry Analysis and Forecast 2018-2028'. The global a2 milk market is estimated to be valued at around US$ 1,541.4 Mn in 2018. The a2 milk market is projected to register a CAGR of 10.2% in terms of value during the period of forecast, due to various factors influencing the market, regarding which, Transparency Market Research offers detailed insights.

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The urbanization trend and increasing per capita income have changed the eating habits of consumers in Asia Pacific. The number of health-conscious consumers has been increasing; consumers prefer healthy food even though it is costlier. Also, with increased purchasing power for healthy foods, Asia Pacific is experiencing a significant compound annual growth rate in the global a2 milk market, due to the increasing consumption of dairy foods containing a2 milk. It is expected that, Asia Pacific would have a high growth rate of around 11.8% in the a2 milk market in the coming years.

Growing consumer health awareness has fuelled the demand for organic products. Consumers all over the world are opting for organic food, as organic products are much healthier and safe to consume. The organic a2 milk segment is expected to experience a significant growth rate in the coming years, due to consumer preference for organic and natural food products. Globally, the organic a2 milk market is expected to grow at a CAGR of 10.6% during the forecast period.