Organic and regular dairy products contain the same combination of nutrients including calcium, vitamin D, and potassium. Organic certification standards in the U.S. don't even require cows to be grass fed.
Translucent plastic packaging has been known to allow some nutrient loss. Processors and grocers have improved dairy case lighting and plastic formulation to minimize this. The fast turnover of gallon milk sales means that isn't a significant concern. Consumers can feel safe in choosing based upon taste.
I'm disappointed that a Dean Foods lab supervisor would give a phone interview with unreferenced information.
Proud families own 99 percent of dairy farms. Please visit ours and learn the truth first-hand.