The aim of the studies was to get insight into the development of selected haematological and biochemical blood parameters in cows imported from Holland as pregnant heifers; the other aim was an attempt to estimate the effect of the parameters on resulting performance and fertility of the cows. Detailed blood analyses were done on a group of randomly selected 25 pregnant heifers, which next became primiparous cows. Blood was sampled in 3. days from the import as well as after a half-year period presence in the new environment. The primiparous cows demonstrated very low fertility and, what is more, their milk yields did not correspond to those determined genetically. The blood examination revealed that a number of basic biochemical indices, particularly those of mineral components, deviated from the standards.

57-66