The article presents the data study on the effect of recombinant avian alpha-interferon used by poultry flocks on the histomorphological structure of the spleen of broilers of Cobb 500 cross. The study shows the spleen of the experimental group chickens in a state of physiological maturity, which indicates the formation of the spleen as an immune organ in the early postnatal period becoming an important indicator of determining the state of the organism during its formation and adaptation to the environment.
The experiment was carried out according to the following scheme. In the first group (control), all wheat, barley and corn grains were fed in flattened form, in the second, third and fourth groups 50% of the wheat, barley and corn grain mass (half the daily supply) was prepared in various ways. In the second group, they were sprouted, in the third, they were extruded, and in the fourth, they were comprehensively prepared by sprouting and then extruding. The differences in the specified nutrients between the first and second groups were unreliable and were at the level of 0.9-2.2 relative percent. The extrusion of wheat, barley, and corn grains and their inclusion into the fodder mixture of animals of the third group contributed to an even greater increase in the digestibility of substances in comparison with the first and second groups. The differences amounted to 1.9-3.4% and showed reliable differences in dry matter and nitrogen-free extract substances. In the fourth group of cows fed with a mixture of comprehensively processed grain components, the digestibility of all substances showed a noticeable increase; the difference with control was reliable and amounted to 2.7-5.4 relative percent.
The automatic adaptive feeder for fish feeding in recirculation plants has been developed and tested. It was found that the use of this feeder allowed to increase the yield of fry per 1 m³ by 35% and 13.6%; the yield of fingerlingby 45.9% and 18.5%; in the final period of cultivationby 52.3% and 21.9% in comparison with hand-feeding and traditional auto-feeding without the adaptation function of the autofeeder. Accordingly, using an automatic adaptive feeder, it was possible to obtain by 71.7 kg and 37.6 kg more fish per 1 m³ of recirculating aquaculture system (RAS) during one production cycle than using the existing technology. It helps to make an additional clear profit from the sale of products for 6,702 rubles 88 kopecks from 1 m³ of RAS in comparison with handfeeding and 3,503 rubles 09 kopecks in comparison with automatic feeding without the adaptation system. Keywords-recycling plants for fish farming, RAS, fish automatic feeding, automatic feeder for fish, feeding behavior of fish, sharp-tooth catfish A computer program for the analysis and inspection of chemical composition (ammonium nitrogen, nitrite ions, nitrate ions, oxygen), water temperature and atmospheric
In order to increase the post-vaccination immune response during vaccination of calves against salmonellosis, a test was carried out with an inactivated emulsified vaccine against the background of the use of the probiotic Profort. The studies were carried out on the basis of a large livestock farm in the Voronezh region, unfavorable for salmonellosis of calves. Epizootological, clinical, immunological, hematological, molecular genetic research methods were used in the work. Studies have shown that vaccination of calves against salmonellosis against the background of the use of the probiotic preparation Profort with an inactivated emulsified vaccine contributed to the development of intense cellular immunity – an increase in the total number of lymphocytes and T-cells by 7.0%, B-cells – by 2.8%%, phagocytic activity of neutrophils - by 5.9%, phagocytic number – by 7.2%, phagocytic index – by 7.0%, as well as humoral immunity factors – BaS by 3.0%, LaS – by 3.0%%, CaS – by 1.7%, O- and H-agglutinins to salmonella antigen – 1.5 and 2 times, respectively. The use of Profort increases the protective properties of the vaccine against salmonellosis, helps to reduce the incidence by 13.3%, and increase the safety of young animals by 26.6%. Therefore, to optimize the use of Profort probiotic, it is necessary to take into account its immunomodulatory effect.
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