National milk Day 2021. This day is celebrate for commemorate on first milk delivers that began in US in glass bottles ,Alexander Campbell of the New York Dairy Company professed to the New York State Senate that his company was the first to make these deliveries in 1878. US and Australia export more milk and milk products than other country ,as we know milk has many products and has well pretiens ,vitamins content .and this day was requested by the international association of milk inspectors for resolution in the naming an observance of national milk day .