Although civilized ladies have not yet devised methods of transference of childbirth to their fellow men, they learned to duck breast-feeding many decades ago, knowing that man as well as woman can lift a bottle. "Mother's Milk" came to apply solely to human mothers, while mother bovine milk was simply cows' milk. Breast milk meant human milk, presumably because cows are differently equipped, and sentimentality of expression reigns.
Compared to that of the human mother, the cow's babe must flourish on 25% less fat and a third less carbohydrate, while prospering on more than twice as much protein. For two hundred years, pediatricians have successfully "readjusted" the milk of the cow to equal that of
Fite GL. Women's Ad-Lib. JAMA. 1974;228(2):205. doi:10.1001/jama.1974.03230270049031