Nice video, keeping things simple.
We actually do this on a much larger scale with the feed for our cows. Cows are fed a TMR (Total Mixed Ration). This has everything needed in it for them to produce milk efficiently and stay healthy. Cows are creatures of habit and do not like variation in their food, unlike humans who do. When you change a cows diet drastically they get "stressed". "Stress" happens anytime you change their environment slightly. "Stress" is noticed due to reduced milk production for that day. Why are they so sensitive? I don't know, maybe its their small brain size.
Due to prices of some commodities we feed a lot of byproducts. Just like baking a cake you need a little of this, a little of that and a lot of other things. With the little things its very easy to add too much as it is loaded by machine. To prevent these mixup's, which are costly in both feed loss and milk loss, we will do a premix much like what Roshan showed with products. It works well.
Sorry for the somewhat OT post, just reminded me of that.