The serum concentration of haptoglobin was measured in 51 cows with to
xic puerperal metritis;which were being treated with one of three diff
erent antimicrobial regimens. The mean concentration of haptoglobin wa
s 19.0 mg/dl on the day that the treatments began and declined steadil
y during the five day treatment period to a mean concentration of 7.35
mg/dl, There was no correlation between the serum haptoglobin concent
rations and the rectal temperatures of the cows during the five days.