Syrinx sexing?

[KentouTundra]

Educational question:
For those who sex their ducklings at under 2 weeks, what method do you all use? Vent sexing?

In my quest for a method less taxing on my patience (I don't get much practice with vent sexing), I came across this 1962 article in Poultry Science describing larynx/syrinx sexing: https://www.sciencedirect.com/.../pii/S0032579119376886

Has anyone heard of this method or have experience with it?

An even older study (1950) in the same journal, has a data table showing male vs female growth rates of the syrinx at 100x vs 20x, respectively, from day-old to 4-weeks-old: https://www.sciencedirect.com/.../pii/S0032579119510240

Assuming both articles are still scientifically valid, perhaps the syrinx would show a noticeable difference in even 1 week old ducklings with such a vastly different growth rate.

My concern with the 1962 study is that it claims day-old ducklings can be sexed with this method whereas the 1950 study shows syrinx weight to be same with dimorphism to become apparent over time, albeit rapidly.

 

[Quatie]

In my quest for a method less taxing on my patience (I don't get much practice with vent sexing), I came across this 1962 article in Poultry Science describing larynx/syrinx sexing: https://www.sciencedirect.com/.../pii/S0032579119376886

I have not heard of this before. It would be an interesting thing to test out. Granted, if it worked so well, I would think major waterfowl breeders would use it instead of vent sexing. I would be interested in hearing if anyone had tried it. Sex linked ducks would be great to try it on. You already know who is male or female, so you could tell if it works.

An even older study (1950) in the same journal, has a data table showing male vs female growth rates of the syrinx at 100x vs 20x, respectively, from day-old to 4-weeks-old: https://www.sciencedirect.com/.../pii/S0032579119510240

The article in question was looking at the effects of testosterone on development of the vocal cords, not sexing ducks. They also did their study in such a small number of ducks that I wouldn't trust the study any way.