A good queen cannot ignore the crossing with selected drones for enhancing and increasing the level of good traits that you want to preserve on female line and adding and increasing all those traits that have an additive and recessive transmissibility.
The choice of drone lines is crucial and is the most important element in a company’s strategy: neglecting this aspect means relegating all one’s work to randomness. In addition, this is the only tool that a company has at its disposal to achieve an extensive, fast and measurable genetic improvement, which embraces all of its female lines.
Working on drone lines is an important value also when not operating in an isolated area. A correct saturation with different drone lines with each one adding certain peculiar characteristics guarantees a certainty of at least 70-80% in the crossing. We are not talking about selection but about an optimal system to combine controlled heterosis with heritability and holding characters
The importance of drone lines in mating is the key to achieving, maintaining and measuring a beekeeping genetic improvement based on hereditary genetic traits.