In fact, many livestock are given subtheraputic antibiotic doses[0] to increase their weight gain, but the mechanism isn't known for why it works. In that case

In fact, many livestock are given subtheraputic antibiotic doses[0] to increase their weight gain, but the mechanism isn't known for why it works. In that case it feels like it almost has to be a shift of the bacterial community that causes it. [0] https://scholar.google.com/scholar?as_ylo=2015&q=subtherapeutic+antibiotic+use+in+livestock&hl=en&as_sdt=0,22&as_vis=1 https://scholar.google.com/scholar?as_ylo=2015&q=subtherapeu...