[MattDavey]

Well, when I get an email notification.

See my website for up to date instructions and notes for Opening the Sides of the Brood Nest (OSBN):
http://daveybees.wikidot.com/openingthesides

For the discussion see this Thread:
https://www.beesource.com/forums/showthread.php?351975-Want-Swarm-Prevention-Try-the-OSBN-Method

It was developed for Beekeepers who don't have much Drawn Comb to use for Swarm Prevention.

 

[MattDavey]

Hi Nancy, good to hear from you.

I actually haven't experimented much with adding drawn comb beside the Broodnest.
Sometimes the Queen with lay in the empty comb, but I have seen quite a number of people post that the bees just filled the comb with nectar and pollen.

But with Partial (OSBN) frames, the Queen will usually lay eggs in the new comb as it is being built.

Have a look at this photo on the OSBN Thread from Clong:
https://www.beesource.com/forums/attachment.php?attachmentid=47027&d=1553609712

Notice the capped Brood cells are in the new comb.

With drawn comb the Queen is dependant on the workers to clean and polish the cells ready for Brood rearing. But from Swarm Season on they are wanting to reduce the Broodnest.

With new comb the Queen will lay in it as it is being built, so is not dependant on workers (other than building the cell). You'll also notice that the workers don't start putting nectar in the cells until they are around half drawn. So Partial frames are more likely to have eggs laid in them. The Open Brood then helps to prevent Swarming.

I would use Partial (OSBN) frames. But you could always use a Partial (OSBN) frame on one side and a Drawn Frame on the other side of the Broodnest to compare the difference between the two.