EN
The studies were carried out on an industrial fattening unit of Agrocomplex type. The following haematological and biochemical indices were determined: Na, K, Ca, P-mineral and total protein content, AlAT, AspAT and AP activities and also the level of urea. Blood samples were taken from 145 piglets at 0, 6th, 12th, 24th, 72nd and 120th hour of their life. The following changes were found: an increase of RBC count, per cent of neutrophils, total protein level, activities of AspAT, AlAT and de Ritis ratio. Simultaneously a decrease of RBC count, percentage of monocytes and lymphocytes, the level of Na and K during the first six hours of life were observed as well. The changes in these parameters promote the acquisition by piglets a high level of passive immunity in the first hours of life; at the same time there is a strong reaction of piglets to stress associated with parturition.