[Cell-count changes in tank-samples of milk in the period from May to December 1975]

In the period from May to December 1975, in the Central State Veterinary Institute in Bratislava 740 tank samples of milk were examined for the count of cells. Cells were counted electronically by means of the "Coulter Counter" apparatus. The results were evaluated according to the Pearson et al. key method (1971) as modified by Booth (1973). It was found that 36.8% of the samples showed values up to 500 000 cells per 1 ml of milk. The study of changes in the cell count in milk revealed that the percentage of samples up to 500 000 cells per 1 ml of milk gradually increased from May and that the highest values were obtained in November. On the other hand, the proportion of milk samples having more than 5000 000 cells per 1 ml gradually decreased in this period and the lowest values were obtained in November.