I just introduced ten mated queens I purchased from a supplier who made them to my specs.  So far, I lost two before release, and I think I did everything right.  

Personally, I doubt I hit 80% when using mated queens if losses before, duiring and after introduction are figured in.

I'd like to hear what others success rate is and why.  I suspect many people simply do not know, because when they are introducing, the bees may already have a queen or be raising a queen which deposes the purchased queen in short order.  Unless people are paying careful attention, a queen is a queen.

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