This study examined the impact on a colony's honey production of providing it with a natural amount (20%) of drone comb. Over 3 summers, for the period mid May to late August, I measured the weight gains of 10 colonies, 5 with drone comb and 5 without it. Colonies with drone comb gained only 25.2 [$\pm$] 16.0 kg whereas those without drone comb gained 48.8 [$\pm$] 14.8 kg.
Seeley (2001) The effect of drone comb on a honey bee colony's production of honey Apidologie Volume 33, Number 1, January-February 2002
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