Abstract
In livestock, a comprehensive understanding of the early-life establishment and acquisition of commensal gut microbiota allow us to develop better husbandry management operations and manipulate the gut microbiota for young animals, improving the efficiency of animal production. Here, we collected 123 microbial samples of 11 healthy goat kids and their mothers to investigate the colonization and acquisition of the gut microbiota and their correlations with volatile fatty acids (VFAs) in goat kids from birth to day 56. An age-dependent increasing and more homogeneous diversity were observed for the feces of goat kids. Overall, Firmicutes, Bacteroidetes, and Proteobacteria were the predominant phyla in the fecal microbiota of goat kids, but their relative abundance varied considerably with age. Accordingly, the colonization of the fecal microbiota in goat kids was divided into three distinct stages: newborn (day 0), non-rumination stage (days 7–21), and transition stages (days 28–56). LEfSe analysis revealed a total of 49 bacterial biomarkers that are stage-specific (LDA score > 3, P < 0.05). Significant Spearman correlations (P < 0.05) were observed between the abundances of several bacterial biomarkers and the VFA concentrations. Furthermore, a substantial difference in the fecal microbiota composition was present between 56-day-old goat kids and mothers, whereas there was a moderate difference in the rumen microbiota between them. Among four body sites (i.e., feces, oral cavity, vagina, and breast milk) of mothers, the maternal vaginal and breast milk microbiota were the major source of the fecal microbiota of goat kids in the first 56 days after birth, although their contributions decreased with age and unknown sources increased after day 28. In summary, we concluded that the gut bacterial community in goat kids after birth was mainly acquired from the maternal vagina and breast milk. Its colonization showed three distinct phases with dramatic shifts of composition mainly driven by age and diet changes. Our results provide a framework for a better understanding of the roles of the gut microbiota in young ruminants.
Highlights
The gastrointestinal tract of mammals is inhabited by trillions of microbes that play essential roles in host physiology, development, and health (Guarner and Malagelada, 2003; Lynch and Pedersen, 2016)
The alpha diversity still increased with age, there were no significant differences in the Shannon index among the feces of 28- to 56-day-old goat kids (P = 0.102, Kruskal– Wallis test), suggesting a more complex but similar bacterial community over time
Other studies showed that the first 2 days of life were the initial phase of the gut microbiota establishment in ruminants, according to the analyses of the ruminal microbiota and volatile fatty acids (VFAs) concentrations in calves (Rey et al, 2014) and goat kids (Abecia et al, 2014)
Summary
The gastrointestinal tract of mammals is inhabited by trillions of microbes that play essential roles in host physiology, development, and health (Guarner and Malagelada, 2003; Lynch and Pedersen, 2016). The initial establishment of the gut microbial community in ruminant kids after birth generally occurs in three successive stages: the initial colonization stage, the transitional stage, and the mature stage (Buddle et al, 2011), according to the observations on the rumen microbiota in early life (Li et al, 2012; Jami et al, 2013; Rey et al, 2014; Jiao et al, 2015b; Zhang et al, 2019). A better understanding of the acquisition of microbes for newborn livestock is needed, which allows us to develop more advanced methods to manipulate the gut microbiota and would help improve the health and productivity in the later life of animals
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