Some of their claims are beyond dispute: Dairy cows are repeatedly impregnated by artificial insemination and have their newborns taken away at birth. Female calves are confined to individual pens and have their horn buds destroyed when they are about eight weeks old. The males are not so lucky. Soon after birth, they are trucked off to veal farms or cattle ranches where they end up as hamburger meat.
The typical dairy cow in the United States will spend its entire life inside a concrete-floored enclosure, and although they can live 20 years, most are sent to slaughter after four or five years when their milk production wanes.
For some sources to back that up
https://www.nytimes.com/2020/12/29/science/dairy-farming-cows-milk.html