How much longer (sexing ducks)?

[vfem]

I know I can start looking for a Curl in a male ducks tail to help me sex my pekins. At what age with this curl be visible? Right now they both look flat like you would expect on a female. Neither are making any more sounds I can distinguish as a quack yet either.

They are both 9 weeks this week. How much longer until the females voice changes or I can see that curl?

 

[shelleyd2008]

The drake feather comes in around 4 months or so, but I have 2 pekins that are 3 weeks old, and one of them is definitely trying to quack already. I would say yours are probably boys if they aren't trying to quack.

 

[ChickenToes]

I want to say the drake feather comes in around 11 weeks, but I could be wrong about that. All I know is that it took about 14 weeks for my drake's curly feather to come in. I knew he was a male though, he started getting in his male coloring long before the drake feather came in.

Even at 9 weeks you may be able to tell the males from the females by the quacking. My females were extremely loud at 9 weeks old.

 

[Laskaland]

Now I have Rouens, but it was 17 weeks before they turned boy on me
Christina

 

[vfem]

They make the low peep sounds they've made since they were born. Born very vocal always... right now I don't hear much from them as they're out on the pond most the time. They are out in the yard with the chickens now and I'm not so sure. One definitely looks malish to me?

I have some pictures I took I can upload and try to see if I can tell then.