There have been quantitative calculations for antibiotics taught for years in ag departments, and known among industry practitioners. Farming is a highly quanti

There have been quantitative calculations for antibiotics taught for years in ag departments, and known among industry practitioners. Farming is a highly quantitative industry, and any agent of growth promotion is tracked carefully along with feed energy & cost inputs. Today you may have to go back to older documents to see talk about it in a more open manner though. Here's a more industrial type of analysis paper (2003) https://www.cambridge.org/core/journals/journal-of-agricultural-and-applied-economics/article/productivity-and-economic-effects-of-antibiotics-used-for-growth-promotion-in-us-pork-production/63959BF885FCE4C2E8C55BBFF566F8F5 https://www.cambridge.org/core/journals/journal-of-agricultu...