DENVER (AP) -- State agriculture officials say four slaughtered dairy cows from a southern Colorado herd have tested positive for bovine tuberculosis, but none of the meat ever made it to market.

Commercially sold milk is pasteurized, so bacteria would have been killed.

State veterinarian Keith Roehr said Friday there's no reason to believe any other areas are infected.

The Colorado Department of Agriculture didn't name the dairy, but Roehr says it has about 500 milking cows and about 200 replacement heifers.

Agriculture officials had tested the herd for tuberculosis after a slaughtered cow was found with telltale internal lesions in March.

Roehr says the last time Colorado had positive bovine tuberculosis tests was about three years ago.

Copyright 2010 The AP.

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