With liver and kidney damage, sounds like you better take him to the sales barn and get what you can get. Cattle can live quite a while with acorn poisoning. There are so many different levels and varieties that you cant predict exactly what will happen, but most of the time, they dont get over it. The big problem with the acorns where I live is that they swallow them whole and they pack in the stomach and the sharp tips cut the stomach lining and it gets infected. Once that happens, they will show scours and get lethargic and thin and wont eat and you can keep them full of antibiotics, but seldom does it cure the problem once it gets to that stage