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Copper sulfate was substituted for mercury as the catalyst in the International Dairy Federation (IDF) Standard 20A:1986 method for the determination of nitrogen content in milk. The substitution was supported by results obtained in an interlaboratory study by 24 laboratories in 12 countries. Each laboratory analyzed 12 test samples of milk as blind(More)
The susceptibility of lactating cows to experimental challenge with two strains of Staphylococcus aureus was investigated 30 days after calving. These cows were previously immunized during the dry-period and udder quarters were fitted at drying-off with a polyethylene intramammary device (IMD). Incidence of infection recorded in device-fitted quarters and(More)
  • R Grappin
  • Journal - Association of Official Analytical…
  • 1986
The International Dairy Federation develops and studies methods for the analysis of milk and milk products. A first draft of an IDF protocol for conducting interlaboratory studies is presented. Major features of the protocol are type and number of participating laboratories; nature, duplication, and number of sample materials; final design (numbers of(More)
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