>>Most researchers and bee breeding books rate hybrid vigor at a 30%
increase in production.

Bob, in your experience, is it sufficient to cross between two 
distinct populations of bees within the same race or do you have to 
have genes from different races to see the marked hybrid vigor 
increase?

If you have to have different races how do you go about stipulating 
which combinations of races will give the greatest effect?  Is it 
trial and error?

Waldemar
Long Island, NY

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