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If you have swarmy bees, they surely try to swarm 100% what ever you do.
I have seen, that Italian bee stock can be as swarmy as AMM. If the beekeeper does not mind to select his queen, the stock becomes swarmy. It is bees' natural and original habit.
Swarming is bees' habit propagate. There is no such animal in the world which does not propagate.
Non swarmy bee stocks are rare and laborous to mantain.
If queens mate freely with mongrels they surely swarms. It is more natural than non swarming.
And AMM, it is least wanted commercial beerace in the world. AMM and Carniolans are very swarmy bees.
What I know about races of bee is limited.
Stereotypically the dark English bee apis mellifera mellifera is nasty, disease prone and not wanted commercially, its always had bad press.
The Italian on the other hand is relatively gentle, rather calm and produces well. It can be slow in spring development, but is a good housekeeper and proficient comb builder. But it is the king of the robbers. (there are many sub species.)
Brother Adam said that Carniolans were the quietest and gentlest of all bee races. They reportedly have an "explosive" early spring build up at the first sign of pollen and a great sense of orientation so don't tend to rob; but their swarming propensity is strong.
The Buckfast, (now is that a "race" or a good "hybrid"?) has most of the good points of Italians, but is not as gentle as
well bred Italians and not as gentle and calm as a Carniolan.
The Caucasian bee tends to have a slower spring build up than other bees. It is best known for having perhaps the longest tongue (6.8 -7.4 mm.) of any bee. It is extremely gentle but does use a massive amount of propolis.
I am sure others can add knowledge and experience.
Which characteristics would you emphasize as important when selecting bees ?