in recent years, the level of A2 beta-casein in New Zealand milk has been increasing rapidly and the level of A1 beta-casein has been correspondingly decreasing.
Unpublished data from New Zealand's leading herd-improvement cooperative, LIC, which was supplied to me on request, indicate that once the 2023-born dairy calves join the milking herd in 2025, these two-year-olds will produce beta-casein that is approximately 84% A2. In contrast, only 16% of their beta-casein will be A1.
This is a remarkable difference from the early to mid-1990s, when the proportion of A2 beta-casein in New Zealand milk was reported in various medical papers, using data from the New Zealand Dairy Research Institute, now part of Fonterra, as approximately 50%.
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