We feed our cows a small amount of sweet grain every afternoon...just to keep them coming to the corral so we can check them and their calves every day. Last week we bought several bags of our usual Double Grain Sweet Feed by Cargill. On a normal day they would nearly trample me and each other getting to their grain. On Friday I started feeding from the new bags of grain...they smelled it and then start changing places around the feeder. I've never seen anything like it! They turned around and mooed at me and really didn't want to eat it. Eventually they did start picking at it and did clean it up. Makes me think something is wrong with the grain although to my nose and eyes it appears ok. I haven't fed any more since the first time last Friday. Should I return this grain to the feed store for exchange? Has anyone else ever had an experience like this? I have 4 nursing cows and don't want to run the risk of the calves getting sick. What do you think?