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The present study investigated the development of intestinal lactic acid bacteria (LAB) in piglets by high-throughput sequencing. Fresh feces from newborn piglets were collected at the ages of 1, 2, 3, 7, 14, 21, 24, 35 and 42 days. Sequencing of DNA amplicons of bacteria in feces amplified with LAB-specific primers showed that  Lactobacillus  was the predominant genus with an abundance higher than 70%, but tended to decrease after weaning ( p  = 0.059). The abundance of  Streptococcus  was the second predominant genus on day 1, then decreased significantly ( p  &lt; 0.05). The relative abundance of  Facklamia ,  Bacillus  and  Aerosphaera  increased significantly after weaning ( p  &lt; 0.05). At the species level,  Lactobacillus reuteri ,  Uncultured Lactobacillus  sp. and  Lactobacillus mucosae  dominated on day 3.  Lactobacillus reuteri  was the predominant bacteria at 7, 21, 24 and 35 days of age, and  Lactobacillus  sp.  MWBPC 1-3-1  dominated on day 42. The relative abundance of  Lactobacillus vaginalis ,  Lactobacillus johnsonii  and  Lactobacillus gasseri  on day 24 was significantly higher than other ages ( p  &lt; 0.05). These results indicate that the structure and predominant species of LAB changed dramatically from birth to weaning, which is of great significance to explore the LAB for the health of piglets.

The development of intestinal lactic acid bacteria in piglets as determined by high-throughput sequencing