PECULIARITIES OF POST-FIRM REHABILITATION PIGLES DEPENDING ON THE SEASON OF BIRTH

Abstract

The features of the rehabilitation of the immune system of piglets after weaning were studied in connection with different seasons of farrowing. To fulfill this goal, 4 groups were formed from the offspring of sows of the SM-1 breed of Novosibirsk selection. The 1st group included piglets from winter farrowings, and the 2nd, 3rd and 4th groups, respectively, young animals born in spring, summer and autumn. Each group consisted of 30 animals. Studies of indicators of the immune status were carried out before weaning and 30 days after weaning. Weaning of piglets from sows with their subsequent regrouping in the educational farm «Tulinskoye» is carried out at the age of 60 days. The research results have shown that the state of the immune status of 2- and 3-month-old pigs is seasonal. Piglets born in autumn show the best indicators of leukopoiesis, T-, B-lymphopoiesis, the formation of functionally mature T-lymphocytes, activated T-lymphocytes and antitelogenesis. The second position in terms of the intensity of leukopoiesis, antitelogenesis and B-lymphopoiesis is occupied by young animals born in summer. Piglets raised in winter differ from their peers in a low level of IgM synthesis, while piglets born in spring have the lowest total numbers of T-lymphocytes, T-helper inductors, T-killer suppressors, B-lymphocytes and IgG. A month after weaning, animals, regardless of the season of birth, showed a statistically significant decrease in T-lymphopoiesis. The activity of the T-link of the immune system decreased most significantly in young animals obtained in spring. However, in contrast to their peers, youngsters born in the spring showed a statistically significant increase in blood IgM and IgG concentrations. In piglets born in winter, summer and autumn, the activity of IgM synthesis, on the contrary, decreased, while the formation of IgG remained at the same level.