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Archeological evidence suggests that the original need to domesticate cats centered around the human need to safeguard grain stores from rodent pests. There is no actual evidence for this, but most speculations say that this started in the Fertile Crescent, around modern - day Egypt and Turkey. Today farm cats, also known as barn cats, are still common, and are cats kept primarily for the purpose of catching the smaller vermin found on farms and ranches, which would otherwise eat and/or contaminate the farmer's crops, especially grain or feed stocks.
Though farm cats may have a more wild temperament than cats kept as pets, they may be treated as house cats or derive sustenance solely from their job of lowering the mouse and rat populations. In the latter case, lack of guaranteed food supply, and the necessity of physical exertion on their part, may tend to cause these cats to be much leaner than their domestic counterparts.
On dairy farms, barn cats are often rewarded in milk for their work at hunting vermin. Most drink milk from a pan or bowl, but some learn to take it from the fountain (where a farmhand squeezes the cow's teat, squirting milk over a short distance directly into the cat's mouth).
If the population of adult female farm cats is kept high enough (about 3-6 breeding females, depending on the location) their population can be self-sustaining for several years. The females will establish permanent homes in barns or other structures, especially if they are fed and sheltered there. Males will almost always leave permanently, only returning to mate. This can lead to inbreeding, as the male offspring return to impregnate their mothers.
In areas with high numbers of predators, barn cat populations often become extirpated. They can be eaten by raccoons, owls, coyotes, and other animals that prey on creatures of their size.
In the past, farmers would control their farm cat population by selling cats to scientific or medical organizations. Carolina Biological used to collect excess farm cats for sale as dissection specimens, but this practice has long been abandoned.