A mother cow who gave birth a few hours ago walks with a full udder and the remaining placenta hanging out. At this farm, calves are taken from their mothers within an hour of being born.
Image: Jo-Anne McArthur / We Animals.
Holstein cows
Humans have selectively bred cows such as Holstein-Friesians to produce ever more milk, placing enormous demands on their bodies. Selection for higher yields can also increase susceptibility to painful udder infections and lameness.[3][4] Dairy cows can live around 20 years,[23] but commercial dairy cows commonly live about 5 years.[22] Health and fertility problems, alongside commercial culling decisions, cut their lives short.[23]
At a glance
the selected trait
milk per U.S. dairy cow compared with 1945[20]
annual milk yield in recorded U.S. Holstein herds[20]
⚠ Documented health problems
Nearly 1 in 4 U.S. dairy cows experienced clinical mastitis in 2013, a painful inflammation of the udder.[21]