Unfortunately, it has been proven that Moo, though similar in chemical makeup and appearance to a cow, does not, in fact, give the same benefits as a cow. This has been shown by the simple observation that while eating cow flesh improves performance by up to 200%, eating moo flesh decreases performance by up to 99%.
As of yet, there is no explanation of this phenomenon, though there have been several hypotheses put forward, including the possibility that the lack of mental activity on the part of moo has led to a rapid disintegration of muscle mass, resulting in a wiry meat that is difficult to digest and will often lead to stomach pains, nausea, and vomiting.
In any case, I thought moo was supposed to be a composer.