I am rearing my last batch of queens for the nucs I intend to overwinter. I have been putting a drop of yogurt rather than royal jelly in my queen cups because it is much cheaper. Sometimes the store doesnt have plain yogurt so I use strawberry or another flavor. Is this a problem? Is there any information I should know about using yogurt over royal jelly? Flavors to avoid, temprature of yogurt, brand or type of yogurt...etc. And is royal jelly far superior than yogurt in queen rearing? thanks.