Here is a secondary description of a study which I was able to find-
http://forum.bodybuilding.com/showthread.php?s=&threadid=86412&perpage=30&pagenumber=2"In a classic experiment, Dr. B. H. Ershoff demonstrated that liver extract was able to boost strength, endurance, performance, and resistance to stress and disease. In a nutshell here's how this occurred:
Dr. Ershoff took three groups of rats and fed them controlled diets for a twelve week period. Group one ate a basic diet fortified with vitamins and minerals. Group two ate as much as they wanted of the same diet plus B vitamins and brewer's yeast. Group three ate the basic diet but had 10% desiccated liver added to their rations.
Then the doctor placed the rats one by one into a drum of water, out of which they could not climb. Therefore, it was either swim or drown. The group one rats swam an average of 13.2 minutes before they all drowned. Group two, an average of 13.4 minutes. Group three, however, were still swimming at the end of two hours, at which time the experiment was concluded. Now either the group three rats had watched the fate of their counterparts very closely, or the liver had something to do with them swimming almost 10 times as long. As far as we know, no other supplement has even come close to liver in improving endurance."
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