U.S. prohibits slaughtering weak, sick cows

• Story Highlights
• "Downer" cows often wallow in feces, upping chance of mad cow disease, infections
  
• Democrats, Humane Society, meat industry all backed the rule change
  
• Slaughterhouse review prompted by February's 143 million-pound beef recall
  
• Review came after Humane Society released footage of cow abuse in California
  
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