I'll give you the farmers perspective on this. Well, mine...,,,trust me
1. Demand for dairy products has grown due to more buying potential of many growing countries, - notably the far east.
2. Increased demand for land due to changed consumer habits. You will need many times more land to produce each calory as meat rather than milk, and yet many times more for milk rather than a calorie of grain energy.
3. Crops in very vital parts of the world production of Dairy and as well meat have been on the lower side recently. Climate issues.