Image:Cattle herd.jpg

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Cattle_herd.jpg (94KB, MIME type: image/jpeg)

A simple blood test that checks the blood urea nitrogen (BUN) levels in cattle can help producers fine-tune their herd's feeding regimen. USDA photo by Keith Weller. Image Number K4328-8.

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This image is a work of the Agricultural Research Service, the research agency of the United States Department of Agriculture. As a work of the U.S. federal government, the image is in the public domain.

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