how do you know if a duck egg is rotten or fertile

1234pekin

In the Brooder
5 Years
Apr 28, 2014
10
0
22
i have pekin ducks and i want to hatch eggs it is the 27th day how can you tell if they are rotten or not
 

SA Farm

Crowing
6 Years
Mar 11, 2013
3,684
596
416
Ontario, Canada
Do you mean they've been in the incubator for 27 days now? They should be in lockdown preparing to hatch on day 28. Normally you would candle before lockdown on day 25 to see how the embryo is doing and to remove any 'duds'.
 
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