Answer Posted / samantha bodnar
A milk test called Brucellosis Ring Test (BRT) is conducted
in dairies two to four times a year by testing a small
sample obtained from the creamery or farm milk tank for
evidence of brucellosis. Milk from each cow in the herd is
pooled and a sample is taken for testing. A suspension of
killed Brucella organisms is added to a small amount of
milk. If the test is positive, a bluish ring forms at the
cream line as the cream rises. All positive herds are
investigated. (from
http://www.cdfa.ca.gov/AHFSS/Animal_Health/Brucellosis_Info.html)
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