OK, I usually let my livestock out to graze in the field on nice days. But I've been noticing something...when my cows are milked before they eat, I generally only get "Good Milk," but after they eat, it can be anywhere from "Good" to "Shining." Does the time you milk them- as in after they eat- affect the quality of the product? Or does it depend on the heart level, or is it random?

Oh, I only have two adult cows, and they're pretty close in heart levels, so...

It is random, because I get shinning milk in the morning from cows sometimes, but most of the time I get perfect milk. (Note: My cows have full heart levels.)