So I signed up for email alerts on this from the last time they ran this course (like, 2-3 years ago?) and got an email alert this morning!
Online equine nutrition course (yes, FREE) from Coursera through The University of Edinburgh. Starts January 27:
https://www.coursera.org/course/equinenutrition I figure, why not? Plus, I heard good things about this last time they ran it.