We have developed a rapid automated immunoassay, using the BIACORE surface plasmon resonance (SPR) biosensor, to measure progesterone in bovine milk. The assay was designed as an inhibition assay with progesterone covalently immobilised to the carboxymethyl dextran matrix of a CM5 sensor chip. A fixed amount of monoclonal anti-progesterone antibody 39C5H7 was mixed 9:1 with the sample and the amount of free antibody was then determined using biomolecular interaction analysis (BIA) by injection of the mixture over the immobilised progesterone sensor surface. The assay was designed to cover the concentration range 0.5 to 50 ng/ml. The limit of detection (LOD) was 3.56 ng/ml. Reproducibility of the assay was very good with both intra-assay and inter-assay coefficients of variation <5%. As results become available within minutes of injection and the procedure involves fully automated instrumentation, we believe that this BIA assay for progesterone in milk could be used in-line in the milking parlour and, thus, provide an important tool for reproductive management of dairy cattle to detect heat and predict pregnancy.
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