With that result we can say that mammals can't live with food alone. They have emotional needs to. Evolution imprinted them with the assumption that emotional needs are formed with soft furry things than with hard metallic objects. Alas, the cloth-mother never respond to their affection thus they grew up to be neurotic and asocial adults.

With these experiments done, animals have emotional needs should be addressed, but I don't see that happening with the billions of animals in dairy industries.

In 1950s and 1960s, Harry Harlow conducted an experiment on infant monkeys separated from their mothers after birth. When given a choice between a metal dummy-mother fitted with milk bottles, and a soft cloth-covered dummy with no milk, the babby monkeys clung to the barren mother for all they ar...