NATURAL RESISTANCE OF PIGS OF DIFFERENT ORIGIN
The article deals with intensification of the pig production, the basis of which is the breeding of modern breeds of pigs on meat productivity, results in tension of almost all functional systems of the body and this often causes the increased susceptibility to unfavourable environmental conditions and lowering the disease resistance. Hence, the study of ways of increasing nonspecific immunity in pigs by using specialized meat breeds of domestic and foreign origin is quite actual and enables to characterize the physiological state of the organism of farm animals in the process of adaptation to certain environmental factors. The purpose of our research was to examine the indicators of the natural resistance of pigs of different origin, according to the age aspect, with the use of specialized meat breeds in the conditions of the Middle Volga region. It has been established that there is an advantage of hybrids over thoroughbred young stock of pigs according to the main indicators of natural resistance. Among hybrids, the best indicators of natural resistance were noticed in young stock of boars Duroc breeds.