No The raisins are a nutrient for the yeast. Most apple ciders do not have enough nutrients for the yeast to survive very long. There are commercial nutrients you can buy at Brew stores. The commercial brand I have used is Wyeast’s Yeast Nutrient. It is blend of vitamins, nitrogen compounds, minerals, zinc and amino acids to help you ensure that fermentation starts quickly and ferments completely. Results in a reduced lag time, more consistent attenuation, and better yeast germination.
Okay, thanks.