Comparison of urea content in milk determined with two different methods
1995
Klopcic, M. | Penca-Habjan, V. | Pogacar, J. (Ljubljana Univ. (Slovenia). Biotechnical Fac., Zootechnical Dept.)
In the period of nine months; from April to the end of December, the bulk milk samples from 11 farms in Gorenjska region were taken once a week to analyse and to determine the urea content in milk. Each time two parallel samples were analysed in two different laboratories and by two different methods. During our research, 368 sample pairs were analysed. In laboratory A the urea content was determined photometrically on COBAS-MIRA, and in laboratory B the enzymatic method was used - Boehringer-Mannheim test combination. The urea content in milk was statistically higher in laboratory A than in laboratory B, where the calculated correlation between measurements of both labs proved high (r=0.75) and statistically significantly different from zero. Also the calculated regression coefficients proved statistically significant. The determination coefficient in our case was 56.3 %.
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