>>I have seen that Glenn apiary breeders consistently last 1 1/2 to 2 
years without mite treatment and then become drone layers.

Any value in keeping the drone layers laying?  The drones should be a good source of resit ant genetics for open matings if the hives can raise lots of them [by adding worker bees to keep the colonies going].

No [known] first hand experience with Glenn's breeders but have heard very good reports about them from other folks.

Waldemar


 

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