Genetic Diversity of Cattle Intestinal Bacteria Detected by High-Output Sequencing

Abstract

The gut microbiota and its development for the health of pets are currently being actively developed. The composition of the gut microbiome is found in the reduction of food intake, the state of the immune system of animals, productivity and growth in livestock content. Also found in the colon are unusual pathogen phyla that can serve as markers of fecal contamination in the environment. We conducted a study of the intestinal microbiome of 12 animals divided into two groups - calves and adult cows. Bacteria of taxa of taxa Actinobacteriota, Bacteroidota, Campilobacterota, Chloroflexi, Cyanobacteria, Desulfobacterota, Fibrobacterota, Firmicutes, Fusobacterota, Halobacterota, Elusimicrobiota, Euryarchaeota, Proteobacteria, Patescibacteria, Spirochaetota, Thermoplasmatota, Verrucomicrobia and a large number of unclassified bacteria were identified.It has been shown that the intestinal microbiome of calves differs from that of adult cows, and diarrhea affects the composition of the intestines of young animals, reducing the biodiversity of the inhabitants. In calves, the Shannon index ranged from 3.18 to 4.3, in adult animals from 4.41 to 5.24. Comparison of the gut microbiomes of healthy calves and calves with diarrhea was carried out using the Hutcheson t-test, the difference was significant (P<<<0.0001). > The main phyla of calf intestinal bacteria are Bacteroidota and Firmicutes, moreover, the diversity and number of microbial lines of Bacteroidota increases with age. Firmicutes of the families Lactobacillae and Lactobacillales_fa, as well as the family Selenomonadaceae, are markers of the juvenile age of animals. Calf-specific Bacteroidota are representatives of Tannerellaceae and Marinifilaceae. The microbiome of adult animals at the phylum level is distinguished by the presence of bacteria Verrucomicrobiota, Desulfobacterota, archaea Methanobacteria and Methanomicrobia. At the level of families and genera, the formed microbiome of cows has unique representatives of Bacteroidota and Firmicutes.Thus, we have presented data on the main representatives of healthy intestinal bacteria of cows and calves, which can later be used to diagnose the physiological state of animals, as well as in environmental studies to detect fecal environmental pollution.