The maximum time between collection at the bulk tank and analysis in the laboratory is 36 hours. If the sample is received after that time the work will still be done but the results cannot be used for official purposes. Similarly, the temperature at pickup and during transportation are critical. If the temperature exceeds 4 degrees Celsius then it is possible that bacteria will grow beyond the concentration in the original bulk tank giving a false result. Milk received in the lab that is above 4 degrees Celsius will be tested but the results will not be considered official.
Component analysis is done on raw milk for the benefit of producers.
Added water is measured through the analysis of the freezing point of the milk. The freezing point is either measured in degrees Celsius or degrees Hortvet. There is no current standard for sheep's milk. It should be remembered when looking at temperatures, that we are looking at values below 0. The addition or dilution of the sample with water will bring the temperature closer to 0.