>>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 ****************************************************** * Full guidelines for BEE-L posting are at: * * http://www.honeybeeworld.com/bee-l/guidelines.htm * ******************************************************