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United States Department of Agriculture

Agricultural Research Service

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Image Number K9314-2

In 2001, BARC researchers develop the first transgenic cow, named “Annie,” with resistance to mastitis. The disease is caused by Staphylococcus aureus bacteria that destroy milk-secreting cells in the animal’s mammary gland. Mastitis costs U.S. dairy farmers about $1.7 billion annually, including lost milk revenues.


Photo by Scott Bauer.

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Last Modified: 3/14/2017
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