I found this in a 1984 publication:

> Don Nelson of Beaverlodge has shown that honey production depends directly on queen-related factors and he found that as few as 28% of package queens remain good queens throughout the season. 

Dave Tegart (1984) Two-Queen Hive Management Using Package Bees in the Peace River Area, Alberta, Canada, Bee World, 65:2, 80-84

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