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Very recent publications in Gut and elsewhere1 2 suggest that gut microbiota affects fertility. The application of faecal microbiota transplantation (FMT) to modify fertility is an emerging novel area of interest.3 FMT from women with polycystic ovary syndrome (PCOS) leads to the disruption of ovarian function and a decrease in fertility which indicates that modification of gut microbiota may be a valuable approach in the management of PCOS.2 FMT of gut microbes, that developed under a high-fat diet, into mice on a normal diet leads to the disruption of spermatogenesis and a reduction of sperm motility,1 which highlights that restoring gut microbiota may be a means of improving disturbed male infertility caused by environmental factors.1 However, to date, there are no reports that address improvements of fertility following FMT. In a recent study,4 we found that busulfan damages spermatogenesis and sperm quality, and disturbs gut microbiota as found in many other studies.5 6 Alginate oligosaccharides (AOS), a natural product with many benefits, rescues busulfan disrupted spermatogenesis by supporting gut microbiota through an increase in ‘beneficial’ bacteria4 such as Bacteroidales and Lactobacillaceae and a decrease in ‘harmful’ bacteria, such as Desulfovibrionaceae.7 Gut microbiota from AOS dosed animals may improve spermatogenesis through benefit to the recipients gut microbes.
To test this hypothesis, we set out to explore the beneficial improvement of sperm quality and …
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