The article provides the results of a comparative analysis of the relationship of swine hepatitis E virus infection with various liver lesions in animals on industrial pig breeding complexes. A wide territorial spread of infection of pigs with hepatitis E virus has been established, which proceeds in the form of a latent infection without pronounced clinical signs. When comparing the results of serological studies for the presence of antibodies to the hepatitis E virus in pigs and the results of post-murder detection of hepatitis, the incidence of pathology is almost the same, 13.6 % and 14.8 %, respectively. In the case, toxic liver dystrophy, as the leading cause of death, accounts for 7.7−10.2 % of cases.
In the thesis describes a material on the morphology of the adrenal cortex of cattle in the postnatal development. Installed topographic features zone of cortex and cells, their comparative morphology and growth patterns under the influence of preparations based on bioelements.
The article deals with the study of insects caught in dairy farms, cultures of microorganisms (staphylococcus, streptococcus, enterobacteria) were isolated and described, which were identified both on the surface and inside the body of these flies. Under the conditions of in vitro an experiment was carried out, on feeding the flies with nutritious food seeded with cultures of microorganisms from mastitis cows, the initial cultures of staphylococcus were isolated. The above experience gives us grounds to draw a preliminary conclusion about the possibility of transfer by flying insects of cultures of microorganisms that cause mastitis in cows.
Pseudomonosis of fur-bearing animals is widespread in the world. Morbidity can be 60%, mortality over 70%. One of the fastest and simplest types of diagnosis of this disease is the PCR method. Given the wide diversity of Pseudomonas in antigenic structure, there is a study of this diversity by molecular biological methods, such as RAPD and ERIC PCR, since the intraspecific difference between Pseudomonas strains should be taken into account in the specific prevention of Pseudomonas.
The article presents data on the biochemical properties of epizootic strains of Pseudomonas aeruginosa. The belonging of the strains to the species Pseudomonas aeruginosa was confirmed by polymerase chain reaction.
The data on the infection of animals with muelleriosis and pathogens of other parasitoses of the respiratory and digestive systems in sheep and goat farms of the Republic of Belarus have been established. The larvamigration (pipette) method for detecting the larvae of Muellerius capillaris, which is superior in efficiency to the existing methods, has been developed.
The article presents the results of studies on the study of the actual timing of the elimination of amoxicillin after the use of veterinary drugs «Amokol 50», «Amoxipharm plus 62.5 %» and «Amoklav» on broiler chickens to establish the waiting period. Tests have shown that the content of amoxicillin in poultry meat one day after the withdrawal of the study veterinary drugs does not exceed the maximum allowable level of residual amounts. The results of the research allowed the manufacturer of these veterinary drugs to make changes to the instructions for use and reduce the waiting period.
The use of whole grains of corn in the amount of 30 and 40% of the weight of compound feed for calves of 10–65 days of age, contributes to an increase in the average daily increase in live weight of young animals over the period of experience by 4.6 and 7.6%, while reducing feed costs by 2.4 and 4.1%, the cost of growth - by 5.4 and 8.3 percent.
This article presents the results of studying the effect of vaccines against infectious pneumoenteritis on the parameters of blood immunity of pregnant cows. It has been established that vaccines against infectious pneumoenteritis activate the studied indicators of cellular and humoral immunity.
The article analyzes the technologies and designs of existing devices for internal cleaning of silos from various physico-biological contaminants.
In commercial lots of fetal bovine serum (FBS), the tuberculosis mycobacteria (MTB) genome was detected and with cell wall deficient (CWD) MTB were isolated. It is clearly associated with the widespread latent tuberculosis infection that is not detected by tuberculin test and traditional bacteriological methods. The seriousness of the problem of such contamination was confirmed by the isolation of CWD MTB from live and inactivated virus vaccines that were obtained using FBS. Isolates from FBS and vaccines demonstrated adaptive properties inherent in CWD MTB, withstood extreme heating and chemical action.
It is indicated that it is necessary to control FBS for the presence of the MTB genome and by inoculating on the special nutrient medium after incubation in the growth stimulant due to the risk of neoplastic processes increased by contaminated vaccines, and due to induced reactions to bovine tuberculin in certain cases.
