It may surprise you, but a big percentage of cows are no longer grass fed in many places. In the USA for instance, most are now corn-fed. This has a huge impact on the Vit K2 content of their milk and meat.
Vit K2 is an essential part of the calcium cycle. Most people now have some degree of K2 deficiency which can lead to osteoporosis, and poor teeth. The bones and teeth suffer from reduced calcium intake while the calcium ends up where it shouldn't, such as in arteries and heart valves, leading to heart attacks or strokes.
So, the point about grass-fed farm animals is a very important one!