We had red cows on the farm lots of them. Whats the big deal with needing to breed them....?
The cow needs to be perfectly red, it can only have one hair that is not red. The animal can have no blemish on it, it can also never be used for work. It must never come into contact with anything unclean.
The Red Heifer is the only animal whose ashes are capable of purifying the Temple and High Priest. Any Priest who comes into contact with the dead can only be purified by the Red Heifer. Thus the Tribulation Temple could never be built without this animal to sacrifice.
Not without any other colored hairs or any blemish you didn't. If you had you would have been billionaires.