Were you born in a barn? Our calves were... Socialization starts on Day One. Our critters are handled 2-3 times every day.
Our cows are good moms. They have all calved quietly and easily. And so quickly, in fact, that we've not yet caught them in the act. They're very maternal and take excellent care of their young.
Our animals are not grain-fed, but they are fed grain, and other bovine delicacies. As with all mammals, food is the key to socialization. A little bit keeps them coming 'round.