I have been an agricultural student for almost six years (including year out). In my work experiences I have often come across ideas, methods, practices or whatever which are unheard of when I am back at college, similarly, I read about practices at college that people in the industry regard as strange. It is a bit disturbing to think that what I have been learning doesn't necessarily make me as knowledgable as I think I should be.
Learning principles in college and applying them in practice to then relate experiences back to studies in an attempt of better understanding is great in theory. Unfortunately in practice is another thing!
But from all my study and experience I think I have established that gut feeling is not to be shunned when working with livestock and if something works why change it?
With regards to the feeding of calves, I think it is important to make sure the calves are eating enough forage aswell as concentrates so that when taking them off milk they do not gorge themselves on the concentrates which may lead to bloat, remember that milk and conc. are digested cocmpletely differently in seperate compartments so a sudden switch is always going to be somewhat tricky for the calf to get used to quickly.
I hope I have made sense and not repeated your own knowledge.