https://aabentlandbrug.dk/faq <- In Danish though. Dairy cows must have access to pastures from April 15th until November, for at least six hours per day.

Inside a cow must have at least 6.6 - 8m2, depending on the size of the cow.

Note that the rules are worse for cows breed for meat.

Interesting. Where I grew up, rural Ohio, was a massive dairy farm where the milk was put into container ships and sent overseas to... Denmark.

Danish dairy products have a huge market in Asia and the Middle East