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 ...
Research generally shows that mature bulls can breed many more cows in a 60 to 90 day breeding season than many people suspect. A commonly accepted recommendation is 25 to 30 cows per mature (2 year ...
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, ...
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