Ejected dead brood

[Beedogg]

5 days ago I moved a frame with a sealed QC and three more frames of BIAS and bees from a colony and into a nuc as an attempt to make increase. I was to hoping to find today that the QC had emerged.

Instead of that I found that it had disappeared and that three new QCs had been created. That didn't particularly surprise me but what did was a pile of 20+ dead brood outside the entrance. As I watched a worker bee took another pupae out of the colony and dumped it outside.

What is going on?

 

[jenkinsbrynmair]

at a guess you didn't shake in enough nurse bees to cover the brood properly and many bees would have flown back to the 'mother' hive, thus a lot of the brood got chilled

 

[Beedogg]

That could be it.