section_path: Bovine growth hormone supplementation/Animal welfare
section_name: Animal welfare
paragraph_text: Animal welfare
  
  Cows receiving rBGH supplements may more frequently contract an udder infection known as mastitis. Problems with mastitis have led to Canada, Australia, New Zealand, and Japan banning milk from rBST treated cows. Mastitis, among other diseases, may be responsible for the fact that levels of white blood cells in milk vary naturally.
  
  rBGH is also banned in the European Union, for reasons of animal welfare.