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Hello, this is Dr. Linda. I hope I can help with your question today.
I am so sorry for your current problems with your cattle. Over fertilization of crops is a possible cause of nitrogen toxicity in cattle. The best thing to do is to send your feed material for analysis. If you have a local farm coop/extension agent, often they will come out or lend you the equipment to take core samples from your bales. Once an analysis has been done, they will recommend either dumping the whole lot, or how to cut these bales with a good grass hay to dilute the nitrogen levels. If you should unfortunately loose another animal, you can also send rumen contents, whole blood or an eye for ammonia content analysis. Ammonia is very volatile, so the samples should be frozen immediately after collection.
In the mean time, it would be prudent to just feed the grass bales. Once you know the nitrogen content of your triple bales, you will know how much you can safely feed.
I hope this makes sense & gives you the information you required. Please let me know if you have any additional questions or concerns.
You are welcome. Sometimes two heads are better than one! I hope you find an answer soon & get this whole thing resolved before you lose anymore animals.