That particular cow, with that amount of manure behind her, looks to me like she died and was chewed on post mortem, or perhaps as she was dying. She also seems thin for a cow who is just about to calve, and the blood looks thin, not the deep dark red I would expect, perhaps it had been raining.
Are there any cherry trees down by the stream? Any other possible toxic plants? I might ask my extension agent about that.
If it is a predator I'd be thinking dogs. A coyote would have eaten a lot more in my experience.






