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Sandwich ELISA were developed to quantitatively determine conglutinin (CG), mannan-binding protein (MBP), and serum amyloid-P component (SAP) in the sera of cattle. The ELISA system was found to have high repeatability for quantitation of these serum proteins at concentration as low as 5 ng/ml. From results obtained for 10 healthy cows aged 2 to 7 years, mean +/- SD serum concentrations were 56.5 +/- 14.4 micrograms of CG/ml, 2.37 +/- 0.87 micrograms of MBP/ml, and 11.14 +/- 3.92 micrograms of SAP/ml, respectively. Values in 6 healthy heifer calves aged 6 months were 3.45 +/- 1.22 micrograms/ml for CG, 1.71 +/- 0.96 micrograms/ml for MBP, and 5.45 +/- 2.75 micrograms/ml for SAP, respectively. Concentrations in 9 healthy bullocks aged 6 months were 1.83 +/- 0.66 micrograms/ml for CG, 1.04 +/- 0.63 micrograms/ml for MBP, and 4.9 +/- 1.13 micrograms/ml for SAP, respectively.

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