livestock vs mammal

livestock

noun
  • Farm animals; animals domesticated for cultivation. 

mammal

noun
  • An animal of the class Mammalia, characterized by being warm-blooded, having hair and producing milk with which to feed its young. 

  • A vertebrate with three bones in the inner ear and one in the jaw. 

How often have the words livestock and mammal occurred in a corpus of books? (source: Google Ngram Viewer )