This is an excellent keynote from Dr Peter Ballerstedt at the 2021 Southwest Missouri Spring Forage Conference. http://springforageconference.com/.
You can download the slides from the presentation here.
https://drive.google.com/file/d/1YyDr-1jRs81PUk5OB1ZmcR4QxtS48sW-/view?usp=sharing