I have fed cattle for the past 20 years. Mine are beef cattle. They were fed breeders cubes, 3/1 meal, "Sweet Feed" or horse and mule, and hay. My father did the same and his father before him. I do not know here in east TExas where you would obtain feed which has neurological tissue. Perhaps it is or was out there, but I have never fed it. (Occassionally we would feed cotton seed meal if it got really cold and wet.)
So, then you don't believe the neurological tissue story?