Fat and protein content of milk are positively correlated within a
population of dairy cattle. There are a lot of factors influencing on milk
composition. The analyses of milk samples in 6 dairy farms of Holstein cows in
the R. of N. Macedonia in 20L9 shows average value from L,1B till 1,31, with the
variation of milk fats and protein ratio between 0,58 and 3,3!. This ratio
between milk fat and protein content telling us about the health status and
occurring of some methabolitic disorders in dairy cows connected with rearing
technology of cows, esspecaialy about there nutrition and selection.