This article is about beekeeping and bee winter survival in Ireland. However, it also cites some European studies regarding queens. The two most applicable to Wisconsin are:
1) Locally raised queens have a longer survival than purchased queens; an average of 83 days longer.
2) It is better from a winter survival standpoint to re-queen in mid-summer. Re-queening during late summer or early fall is not as successful in getting the hive through winter.
http://www.irishexaminer.com/lifestyle/outdoors/survival-of-the-honey-bee-is-critical-for-spring-pollination-430095.html
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