I suppose the J-milk association site is one of the most well-organized and written in easiest Japanese.

Then what was a sort of obsolete dairy culture between Heian and Edo?
Buddhism, esp. Zen school affected a lots.
The Buddha, or oshakasama drank milk.

If the veggie activists controled our life, people in 25th century would probably forget the history in which many enjoy our current food culture...

Or you're just interested in some recipes, try ”ò’¹“ç, it is a local feast in Nara.