I have fed 3 breeder queen nucs a total of 5 measured quarts each of heavy syrup with excellent results! The last two feedings were medicated with Fumagillin.
The bag is filled, I push down on the bag to get most of the air out, place it over a pollen patty, make about 40 small slits around the bag including some on the top and replace the feed rim.
The bees consume the syrup without drowning within 24 to 30 hours with daytime temperatures in the 70's to 80's.
The bees enjoy clustering under their Zip Lock blanket.
The breeder queens were purchased from Glenn Apiaries.