Nope, those are not the right courses. For one reason or another, OKstate isn't doing the standard distance learning courses this fall. I have not gotten a reply to my email asking if they plan on doing "Principles of Animal Nutrition" or "Introduction to Animal Science" this spring, but I will let you guys know as soon as I find out!
As for another alternative offered through OKstate, here are the courses offered through independent study. PLEASE NOTE that I have no idea if "Basic Nutrition for Pets" could fulfill the requirement for OKstate or any other vet school. I do not see Principles of Animal Nutrition in this list, so you may want to start looking elsewhere if you really need this course right now.
http://is.okstate.edu/courses.aspx
Also take notice that the books are included in the cost for these programs.
Good luck and I'll follow up with that info for next semester when I can, plus maybe some insight on why they aren't being offered in the normal way right now.