Dairy cows stand in a field outside of a milking barn at the U.S. Department of Agriculture's National Animal Disease Center research facility in Ames on Aug. 6. (AP Photo/Charlie Neibergall) Buy ...
June 12 (Reuters) - Twenty-four companies are working to develop an avian flu vaccine for cattle, as the virus spreads among U.S. dairy herds, Agriculture Secretary Tom Vilsack told Reuters on ...
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