We had a angus calf born on Monday. She seemed to do well initially, however since yesterday she has gone down hill. She isn't nursing, we bottle fed her yesterday, but now we have tube fed her 3 times today. We have used electrolyte replacer and milk replacer. She doesn't stand, she is weak and grunty. We have injected her with LA 200 yesterday and today. Any ideas? Also can milk replacer go bad? It doesn't smell funny but I am not sure if it's stll good. Any help whatsoever will be greatly appreciated. Also we live in Wisconsin, it was cold earlier in the week but has been in the 40's the past 2 days. She has been kept inside but went outside for a couple of hours yesterday.