Does egg shape determine gender?

[Emmaloveschickens9156]

Worth a shot ig

 

[killmak]

There have been studies in case anyone is interested https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9832119/#:~:text=Sex determination in chicks can be done before or after hatching.

While that is an interesting study they only hatched 47 eggs for the study. It is a good start but an insanely small sample size. You could easily get the same results using a "psychic" with such a small sample size.

 

[Creekchics]

I see this is an old thread, but I hatched only four chicks and it is turning out the only elongated egg is a roo!! Now I am fascinated

 

[RcoM]

I tried this experiment with a lot of eggs to choose from. It didn't make any difference.

 

[TicaCielo]

https://pmc.ncbi.nlm.nih.gov/articles/PMC9832119/

Here is an interesting article about this theory. Apparently, if measured correctly, there is about an 80% accuracy rate.

 

[WingItRanch]

https://pmc.ncbi.nlm.nih.gov/articles/PMC9832119/

Here is an interesting article about this theory. Apparently, if measured correctly, there is about an 80% accuracy rate.

Interesting paper but I wouldn't call it conclusive.

"At the end of the incubation period, forty-seven chicks were hatched out of 60 eggs. Eight out of the unhatched eggs were unfertilized and 5 of them were dead-in-shell as determined using candling. All the unhatched eggs were kept out of the evaluation. Chick sexing was done for alive forty-seven chicks."

The study had a very small sample size of 47 and they used chick sexing to determine if they were right. Chick sexing itself is not accurate and opens themselves up to biases.

 

[TicaCielo]

After the prediction, females classified 80% accurate and males classified 81% accurate. In the study on ducks9, it was found in our study that males have a higher hatching probability than females.

On the prediction side, if our model estimates an egg as a male, it will be 85% accurate, and if it predicts as female, it will be 76% accurate. It means that if our model one egg is male and the other is female, they are not equally trustable. A low shape index value means a very low probability of containing a female chick, but if we have a high shape index egg, it can contain a male egg with a higher chance comparatively.

At the end of the incubation period, forty-seven chicks were hatched out of 60 eggs. Eight out of the unhatched eggs were unfertilized and 5 of them were dead-in-shell as determined using candling. All the unhatched eggs were kept out of the evaluation. Chick sexing was done for alive forty-seven chicks. Female, male, and unhatched eggs are shown in Table 3.

 

[TicaCielo]

After the prediction, females classified 80% accurate and males classified 81% accurate. In the study on ducks9, it was found in our study that males have a higher hatching probability than females.

On the prediction side, if our model estimates an egg as a male, it will be 85% accurate, and if it predicts as female, it will be 76% accurate. It means that if our model one egg is male and the other is female, they are not equally trustable. A low shape index value means a very low probability of containing a female chick, but if we have a high shape index egg, it can contain a male egg with a higher chance comparatively.

At the end of the incubation period, forty-seven chicks were hatched out of 60 eggs. Eight out of the unhatched eggs were unfertilized and 5 of them were dead-in-shell as determined using candling. All the unhatched eggs were kept out of the evaluation. Chick sexing was done for alive forty-seven chicks. Female, male, and unhatched eggs are shown in Table 3.

Nothing is 100% conclusive. Its just an interesting experiment with interesting results is all.

 

[Ladybird CA]

Hey, so after 2 hatching seasons I have discovered the hen determines the gender regardless of egg shape.
I have a light sussex hen #02 who produced 21 pullets from 24 of her eggs last season.
This season 2 of those pullets were retained #08 and #09 and they are also throwing a lot of pullets we have hatched 24 to date (from these 2 hens) and only 2 have been cockerals, however we have another hen who was hatched from different lines last year and she has produced 6 out of 8 cockerals so she is no longer in the breeding pen!
She is however still in the show flock as she won multiple overall reserve champion soft feather last year

Did you notice a difference in the sizes of the hens? I had a columbian rock hen that I hatched 2 chicks from when crossed with a buff laced polish rooster. I only now realize they were cockerels because she was silver and he was gold. There was an EE hen I got with her from the same place and her eggs were often round. She was about half the size of the rock. She was splash so I don’t think she would have produced sex linked chicks but if I had kept those chicks long enough to see if male or female and if they were mostly female I would wonder if nature wanted the males to hatch from the largest hen of the flock.