Toward a better understanding of pig behavior and pig welfare.

  title={Toward a better understanding of pig behavior and pig welfare.},
  author={Apisit Kittawornrat and Jeffrey Zimmerman},
  journal={Animal health research reviews},
  volume={12 1},
Pork production began to flourish in the USA after the practice of finishing pigs on corn was popularized in the late 1600s. By the 1840s, there were 35 million pigs and 20 million people in the USA and Cincinnati was the world's largest pork market. Between 1890 and the present, the total number of pigs in the USA has remained at 50-60 million, but dramatic changes in swine husbandry over the course of the 20th century have metamorphosed pig production from small, extensive (outdoor), labor… CONTINUE READING

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