[Multicausality in the pathology of commercial swine breeding]

Studied were more than 100,000 samples of pathologic tissue material, 1,900 whole blood and blood serum samples, 8,000 fecal samples, 2,600 washings samples, swab samples, and other sampled material via the employment of a number of bacteriologic, virologic, morphologic, hematologic, biochemical, parasitologic, and other routinely applicable laboratory methods over a period of 5 years. All materials were taken from 15 stock swine breeding complexes, 3 reproduction and 2 nucleus bases for hybrid pigs, and 3 swine breeding farms with a practice of extensive raising technology. It was demonstrated that the adaptive capacity of the animals of the Camborough hybrid sharply dropped when the pigs were kept under unconventional conditions of raising, leading to deviations in the application of industrial technology methods. This was the reason to observe the simultaneous manifestation of conditionally substantiated disease outbreaks (multiple causality), with great economic losses. Studied were the etiology and pathogenesis of coli bacteriosis, salmonellosis, gastric ulcer, hypotrophy, atrophic rhinitis, geohelminthiases, chlamydial infections, and erysipelas. Suggested is the use of programmes and methods of prophylaxis and treatment, of expedient diagnosis and control on immunity.