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What are the roles of bacteria in dairy industry?

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Answer: They are used in dairy products such as yogurt and cheese
Cattle have bacteria in their rumen which allows them to digest grasses and other cellulose
They are used in medicine (growing antibiotics) which can be given to cattle
Dairy farmers sometimes collect and treat manure with bacteria to release methane which they use for heating their barns.
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Which country is famous for dairy industry?

The Netherlands.

How are microorganisms used in the dairy industry?

A culture can be a microorganism (if I'm not mistaken), and cultures can create cheese. Otherwise there is Pasteurization, which is killing the microorganisms by boiling the m

Is ozone used in dairy industry?

The answer is yes, but it is not common. The ozone is used as a substitute for chemicals such as Copper Sulfate. Ozone is a great disinfectant and is not damaging if done in t

Is the dairy industry cruel?

That all depends on your opinion.