Consistently hatching more males than females

[PeepingK]

I read that male embryos are better able to survive uneven / hot temperatures in the incubator because of the chromosomal differences.
In mammals like humans, it's the females who are more genetically robust.

So, are you disposing of enough undeveloped eggs that would account for the low female ratio? If so, a different incubator / methodology would be in order.
If you're not removing many undeveloped eggs, then it is genetic.

I read that male embryos are better able to survive uneven / hot temperatures in the incubator because of the chromosomal differences.
In mammals like humans, it's the females who are more genetically robust.

So, are you disposing of enough undeveloped eggs that would account for the low female ratio? If so, a different incubator / methodology would be in order.
If you're not removing many undeveloped eggs, then it is genetic.

I heard that theory as well so I tried lowering the temp in the incubator by half a degree to a degree lower and these were my results. Only 2 females.
This hatch I left the temp at 99-99.5 (forced air) and only had 1 loss

 

[PeepingK]

how could genetics produce anything other than 50-50 male-female on average?

I’ve heard people say that some hens produce more male embryos than females

 

[PeepingK]

Are they all sired by the same rooster

Are they all sired by the same rooster?

The eggs came from 2 separate breeding pens. One pen has a BCM roo and the other has a Whiting True Blue. I noticed that chicks from the whiting true blue pen did not feather sex accurately at all, but all the chicks from the BCM breeding feather sexed accurately.

 

[PeepingK]

I might post some pictures of the chicks as they grow up so we can see if the wing/feather sexing I did was accurate.

 

[SourRoses]

I heard that theory as well so I tried lowering the temp in the incubator by half a degree to a degree lower and these were my results. Only 2 females.
This hatch I left the temp at 99-99.5 (forced air) and only had 1 loss

Did you have to toss eggs?

 

[JacinLarkwell]

The eggs came from 2 separate breeding pens. One pen has a BCM roo and the other has a Whiting True Blue. I noticed that chicks from the whiting true blue pen did not feather sex accurately at all, but all the chicks from the BCM breeding feather sexed accurately.

Unless bred specifically for it, feather sexing is just guesswork

 

[PeepingK]

Did you have to toss eggs?

Only that one egg

 

[PeepingK]

Unless bred specifically for it, feather sexing is just guesswork

I know that’s what everyone says but then why has it worked every time with chicks hatched from my BCM rooster?
All the chicks that he sired last hatch were slow feathering except for 1 and that 1 chick was the only female.

 

[JacinLarkwell]

I know that’s what everyone says but then why has it worked every time with chicks hatched from my BCM rooster?
All the chicks that he sired last hatch were slow feathering except for 1 and that 1 chick was the only female.

Because you could have just gotten lucky and happened to have the right genetics when you put those birds together. I have a few like that in my mixed pen

 

[PeepingK]

Because you could have just gotten lucky and happened to have the right genetics when you put those birds together. I have a few like that in my mixed pen

So does this mean that all chicks hatched from these pairings can be feather sexed?