go to site shopmedvet.com they have feeding tubes. An old oxygen tube will work on adult chickens. I take syringe hook to tube and measure from mouth to bottom of chest and just push it down the chickens throat till it is in his crop you can feel it and know not in lungs and I try to fill him up with ensure, 2cal, jevity or some type of tube feeding. Baby formula works too. Something for nutrition. Even if you cannot use it now you can know this for later on. An adult chicken can hold 90cc young half grown 30 to 45cc small chicken 15cc I always keep my sick chickens hydrated this way. I even blend things to push down my tubes. It does work.