I thought recent research was struggling to reproduce the same growth promotion effects in low dose antibiotics... My money's on "neither harmful, nor especial

I thought recent research was struggling to reproduce the same growth promotion effects in low dose antibiotics... My money's on "neither harmful, nor especially useful" for the long term scientific consensus here... but I admittedly have a natural inclination towards positions that alienate both sides in any dispute. Here's one discussion for poultry, though still digging for the economic analysis for swine and cattle: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1804117/ http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1804117/