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United States Department of Agriculture

Agricultural Research Service

ARS Photo Library

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Image Number K7905-7

To estimate the number of brown stomach worms in a pasture, researchers place a worm-free calf on grass for a measured length of time, then check for parasite eggs in its feces.

Photo by Keith Weller.



640 pixels wide: (k7905-7.jpg)




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Last Modified: 5/23/2006