In Manu Samhita states that we shouldn’t drink (or offer to God):
The milk of a cow (or other female animal) within ten days after her calving, that of camels, of one-hoofed animals, of sheep, of a cow in heat, or of one that has no calf with her.
…and all dairy cows are without calves from the first day!
Rig veda 10 87 17 (from the Indian Cow issue 33):
Milk derived forcibly from cows is poisonous and leads to many kinds of incurable diseases.
Dairy cows are all without calves from the first day – so milk “does not run out of love and affection” to their babies but derived forcibly. And milking them with machines without love and affection touch – so milk again derived forcibly from cows”.
So this milk is “poisonous and leads to many kinds of incurable diseases” and a lot of people this days know that.
He who permits the slaughter of an animal, he who cuts it up, he who kills it, he who buys or sells meat, he who cooks it, he who serves it up, and he who eats it, must all be considered as the slayers of the animal. There is no greater sinner than that Manno who though not worshiping the gods or the ancestors, seeks to increase the bulk of his own flesh by the flesh of other beings. (Manu-samhita 5.51-52)