The aim of the study we have carried out was to see if there are differences between the values of blood serum components (β estradiol, progesterone, and macro-elements) depending on gestation period in both Landrace bearing sows raised extensively (grazing sows) and Landrace bearing sows raised intensively. The results we are presented in this paper. They show big differences between the values of β estradiol in different stages of gestation in Landrace bearing sows. As far as the level of progesterone is concerned, it reaches rather close values with a peak in the 3 rd month of gestation, also close to the value in the 2 nd month of gestation. As for macro-elements, their level fits both data in literature and our own data resulted from a study on bearing sows raised in intensive systems.

sows; gestation; blood; hormone components; macro-elements

Presentation: oral