My mom always made me learn the basics about keeping horses, it used to drive me insane to have to learn how to feed properly and everything. It taught me a few things and how to take care of my own horse.
To tell the truth there are so many supplements out there that it would be impossible to learn them all, but to know the basic grains is probably good. It amazes me that those girls didnt know anything like that.
The way I learned almost everything I have learned is by experience, not drilling it into my head, I can't learn that way. I can tell you what my horse needs, but not when she last got shod, I can tell you why she needs shoes, but not when she last had her teeth done. I can tell when her shoes should be done, and if theres a problem with her teeth, but I don't have those dates in my head.
Personally I don't think all the kids should be drilled hard and pressured so much to know everything about horses, if someone did that to me it might even pressure me to quite (not saying anyone is doing that) but theyre kids, they need to know the responsibilites, but they also need space to just enjoy it, they should be educated, but not pressured to know too many things.
If there are no horses in heaven... im not going.