I went to the source on these questions- I e-mailed the question to Mosti Modiale. Matteo Meglioli responded with the following:
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The entire production of our fresh and pasteurized juice is been added of yeast nutrient not only DAP but even other important survival factor.
You do not need to add any at the begging of the fermentation because the Nitrogen level is already adjusted to 250 +/- 10.
We are adding a new add-pack to our product that contains DAP, to add during the first racking to insure enough nitrogen starting to the 3<SUP>rd</SUP> generation of yeast, this will allow them to have a functional membrane for sugar/alcohol exchange, resulting in a better fermentation avoiding any problem especially toward the end.
Hope this can help.
Matteo Meglioli
To continue with what Joseph said, the 1/2 teaspoon added to the kit after the racking if your all- juice doesn't have one, would be appropriate. I don't know for sure if the Fresco has it added already, but since Matteo says the entire production line has been treated with it, I would assume that one does also.
Mark I assume a half to full teaspoon would be enough of the Fermax. Maybe if George sees this he can respond further.