I did. I use a whole one, but i'm getting some of the liquid that casportpony posted. you can crush a calcium pill too. Tums has artifical flavors, so I like the other options better. But didn’t hurt my birds. Some people give a tablet whole, but that kind of worried me. So I crushed them and diluted in a little water. then fed in a dropper. The egg would pass within a couple of hours. The calcium is for the shell, but many mammals have delivery issues in birth if they are calcium deficient. When my Ausralian Shepherd had her litter, it was recommended to give 1 or 2 tums at onset of delivery (you don’t want alot more than that). It helps with the natural contractions in labor. So it really makes sense in the chickens how it can help in the passage of the egg as well as the strength of the shell.