Social & Preventive Medicine General d41154d7 Amount of whey protein in cow milk is: A 20% B 40% C 60% D 80% High-Yield Explanation Ratio of whey to casein protein in cow milk is 20%:80% while in human milk it is 60%:40%. Ref: Nutrition and Child Development, K.E. Elizabeth, 4th edition pg: 17