Chad Dechow, a geneticist at Penn State University who studies dairy cows, is explaining how all of America's cows ended up so similar to each other. He brings up a website on his computer. "This is ...

There are more than 9 million dairy cows in the United States, and the vast majority of them are Holsteins, large bovines with distinctive black-and-white (sometimes red-and-white) markings. The ...

A Scottish couple has had a compensation claim rejected after arguing one of their pedigree Highland cows became impregnated by their neighbor’s bull. Bernard and Kathleen Allen of Great Bernera, Isle ...

The drive to make more milk has had an unsavory side effect: Cows have become more genetically similar and less fertile. Scientists are trying to... Most U.S. Dairy Cows Are Descended From Just 2 ...

Unlike most dairy cows in America, which are descended from just two bulls, this cow at Pennsylvania State University has a different ancestor: She is the daughter of a bull that lived decades ago, ...