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Just like
any other mammal (including humans), female cows will only produce milk
(called lactating) when they are pregnant or have just had a baby. That means that the
cows must be kept pregnant nearly all of the time so that they can keep
producing milk. It is not natural for any animal to be constantly
pregnant and it therefore causes a strain on her
body.
Scientists
are also trying to make cows produce even more milk, making it even more
of a strain. This can cause a painful condition on the cows udder called
mastitis. |