Milking Barn, Old Dairy, Parlour?

[Vrayna]

The Milking Barn will produce milk. The Dairy Parlour will transform that milk. The major difference between it and the old dairy is how it looks. The Milking barn will produce more milk than an milk pen. If you want the same amount of milk, you'll use fewer workers with the barn than the pens. You could also simply have a pasture with the right cows (friesians if I remember right) to get milk, plus a bit of meat/leather when the pasture is full and the older animals start getting slaughtered.

A lot of the choices are based on what you can afford to build at the time, and what fits best in your town, and efficiency.