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According to The Livestock Conservancy , as of 2016 , three breeds of domestic pig are critically rare ( having a global population of fewer than 2000 ) .
 The Livestock Conservancy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 The Livestock Conservancy