Optimizing performance of a qualitative zinc sulfate turbidity test for passive transfer of immunoglobulin G in calves.


OBJECTIVE To determine optimal zinc sulfate test solution concentration for detecting failure of passive transfer in calves. ANIMALS 235 calves (1 to 8 days old) from a calf-rearing operation in central Washington state. PROCEDURE Zinc sulfate turbidity tests, using 200-, 250-, 300-, 350-, and 400-mg/L test solutions, were performed on calf serum. These… (More)


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