Simple and to the point. I use Oregano Oil too for my chicks and adult chicken flock. One time I noticed one of my Easter Egger 's eye was starting to swell...signs of a respiratory infection! I started putting a few drops of Oregano Oil in all the waters. Astonished to see that her eye went back to normal overnight! Never got sick!! I swear by this. Also in the summer I would soak fresh herbs like mint, lemon balm, Oregano in their waters to make it like a tea for them. But really any time I hear a sneeze, I add Oregano Oil to their waterers. Also we feed them an Organic Non-GMO feed that includes essential oils also. We try to keep them healthy and prevent Illnesses. So far, my eye old Flock have all been healthy! I buy my Oregano Oil from Vitacost in the USA.