I wish the article had gone more into this as it's an interesting topic I had never heard of. Even the wikipedia article [0] gives only passing mention to France, but according to other sources [1], the Channel Island cow breeds which are raised in France produce mainly the A2 protein, whereas the Holstein-Frisian varieties cultivated elsewhere in Europe and in North America produce both A1 and A2.

[0] https://en.wikipedia.org/wiki/A2_milk

[1] https://www.ericksonliving.com/tribune/articles/2017/08/what...