I thought I read this on here before, but now can't find it. How much garlic concentrate do I put in the hen's water in case they have worms...which I think they do?! About 6 of my hens are still doing the shaking first then stretching of the neck like a yawn. I have been dealing with it since I got them..about 3 months. I do not want to give antibiotics and don't want to have to get rid of the eggs. I desperately need a solid answer 'cause in a week or so I need to combine my 2 flocks and want them all in tip top condition. It's so hot (115), but I haven't read that heat could cause the stretching and opening mouth. Thanks again for everything!!!!!