Table 3 presents the general haematological parameters in sows. In addition, Figs. 1 and 2 demon-strate the mean volume of RBC and PLT. The received results, widely known as routine health parameters, point to the lack of significant influence of GM soybean meal MON-40-3-2 and maize MON810. The number of erythrocytes, leukocytes, and trombocytes, their volume and content of haemoglobin did not differ among groups. The mean level of blood parameters, estimated at the beginning of experiment (0) and at the end (1), were similar in both probes.