I know there are mornings when the milkman comes and I do the same procedure, yet after my first set goes out I run to the tank, can't remember if I shut the valve on the tank. There have been times when I worried about putting a dry cow, that had a leg band fall off in the tank. I have my own antibiotic test kit, so I have had to stay up real late a night or 2 running a tank sample, it always was alright, but it gives me that sick feeling when you think you made a mistake, and then when you find out you didn't its all good.Knock on wood I have never put a hot cow in the tank yet.
GMN