New beek here as of last summer ... 4 hives in total ... located in Ontario, between Ottawa and Kingston ... had a great first summer, the girls expanded their hives nicely ... decided not to take any honey. Did a mite count in the fall and literally had none. Went into the winter with 3 very stronge hives and one weaker one. All 4 hives survived the winter and have been given pollen patties and syrup ... still have that one weaker hive however. Last summer I did use drone frames as a preventive measure, I have two of those frames. All our hives are double brood chambers ... my question is the placement of these drone frames. Should I be placing one in each brood chamber and in what positions ... or should I be placing one in each and in what position. The girls utilized them last year and I would remove them regularly at 20/21 days, never did see any mites in any of the cells. Any advice would be much welcomed.