Typically it is because those animals are both easy to domesticate and provide tangible benefits from domestication.
Cows graze land that is often unsuitable for farming and can also be used to produce milk prior to slaughter for beef.
Pigs are natures garbage disposals and can be fed using the waste food that we ourselves cannot eat.
Chickens are quite small and are easy to keep. They also can provide eggs prior to their own slaughter.
Some other animals fit the bill quite well – like goats and sheep – and are also domesticated and common meats in other cultures. Other animals don’t fit the bill well at all – their ranching would be less positive than other, more easily ranched animals.
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