ARTICLE FEED & ADDITIVE MAGAZINE December 2022 65 with pathogenic invaders. At the Phylum level, over 90% of the phylogenetic categories in the cecum either belong to the Phylum Firmicutes (Clostridium, Enterococcus, Lactobacillus and Ruminococcus genera) or to the phylum Bacteriodetes (Bacteroides and Prevotelle genera), while at the species level there are huge differences in microbiota composition. Nevertheless, one constant characteristic of a healthy microbiota is that has a high diversity. Moreover, within the same host, the composition of the microbiota is influenced by a variety of factors. In some cases, this can even lead to dysbiosis, an undesirable alternation of the microbiota resulting in an imbalance between protective and harmful bacteria populations. Dysbiosis was practically unknown until the ban of AGPs, but since then one of the most challenging problems in broilers (Ducatelle et al., 2015). Dysbiosis can also be caused by the diet and especially in times when good quality raw materials are expensive and are not always available; this can be a problem. Nevertheless, a study performed in Brazil showed that the yeast postbiotic Safmannan® was able to increase the microbiota diversity of broilers receiving a low-quality diet. Significant increases in beneficial genera such as, Roseburia, Ruminococcus torques, Eubacterium hallii and Shuttleworthia were observed while Enterobacteria numbers decreased (Figure 5). Figure 3. Broiler final body weight increased significantly by organic selenium enriched yeast Selsaf, compared to other mineral and organic sources of selenium. Figure 4. Laying performance greatly improved by organic selenium enriched yeast Selsaf, compared to other mineral and organic sources of selenium. Figure 5. Higher microbiota diversity observed in broilers in the yeast postbiotic Safmannan group
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