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A nephelometric immunoassay, with a detection range of 0·3 to 5 g IgG1/l, was developed for the determination of immunoglobulin in bovine milk. The assay exhibited no significant cross-reactivity with αS1-casein, αS2-casein, β-casein, κ-casein or β-lactoglobulin and 39% cross-reactivity with IgG2. The nephelometric assay was compared with ELISA and RID (24 h and 48 h incubations) assays using 105 duplicate milk samples covering IgG1 values ranging from 0·45 to 1·8 g1. The results obtained from all assays showed good agreement with the exception of those obtained by the RID assay (24 h incubation) which gave lower results in samples containing more than 1·2 g IgG1/l. It was concluded that the nephelometric assay is a reliable, rapid and convenient method suitable for the quantification of IgG1 in milk. The assay can be configured for routine high-throughput milk quality assurance for IgG1 in dairy laboratories.

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An enzyme immunoassay was developed which could detect sporidesmin in pasture samples. The assay had a linear working range of 0.4-40 ng/ml sporidesmin A while validation using pasture extracts gave mean percentage recoveries of 124% for samples containing 1 ng/ml sporidesmin and 97% for extracts containing 20 ng/ml sporidesmin. The sporidesmin levels and numbers of Pithomyces chartarum spores from many pasture samples were compared. The amount of sporidesmin detected generally corresponded to the number of spores found in the sample.