Zane is crippled, so he has to raise up and flap his wings to belt that out. It's maybe why his sounds like it does, all the effort he has to put into it.
PC, I recorded them as WAV files on my little digital recorder and edited out all but the one section where they crowed (boy, originally, I heard my silly pullet Fern peeping her head off, the broodies clucking and my Delaware, Maxie, mooing like a cow, LOL). Then, Nifty converted them to mp3's and cleaned them up a tad for me. (thanks, Rob!).