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Jim, I have to say that your course is excellent. I can tell you put a lot of thought and time into this as well as assembling a team to make all of it function electronically and flow educationally.
I really like it as I can go back and listen again, double check my notes and take a moment to digest the info. For people who just learned this for the first time, an in-person meeting would be like trying to drink from a fire hose! This method of learning gives us time to think things through.
Awesome, awesome job!👍🏻👍🏻

Grazing only the leaves and leaving stems (unless you like mowing with a tractor, spending $ on fuel, maintenance, and depreciation) leads to a higher % of undesirable plants over time. They persist because you are essentially selecting for them by allowing additional rest because they are not bitten off like the more preferred forage species.

The stems remaining continue to respire, using valuable plant energy that should be used to regrow more leaves, creating a better leaf to stem ratio the next time. This energy used to respire is not contributing to more photosynthesis and thus more fat microbes.

Grazing only 30% and trampling the remainder lead to shading out of individual plant growing points. Wider plant spacing was the result. Many things are on a standard "U" curve. I believe selective grazing to be the same. Depending on your previous grazing practices you will gain individual animal performance and increase stocking rate until you hit the top of the curve as I did. 

Don't make the mistake of starting to ride the curve back down like I did also!

You can, for a time, keep grasses vegetative - keep them from going to seed for a bit with selective grazing. But, the sooner you get to Total Grazing, the sooner you will get to an optimal leaf-to-stem ratio, the long-term solution. As Jaime says, “then your stocking rate will increase”, leading to fat microbes, fat soil, fat plants, fat cows, and a fat wallet.”