Who determines sex of chicks - rooster or hen??

Discussion in 'General breed discussions & FAQ' started by crazy chook, Jun 26, 2010.

  1. crazy chook

    crazy chook Chillin' With My Peeps

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    I have 2 hens with my rooster, one hen lays light brown eggs and the other white. The light brown eggs are turning out to be 90% male and the whitish eggs about 40% roosters hatch.

    So am I correct to assume that it is the hen that determines the sex and not the rooster? Or is it a fluke that the brown eggs are mostly male? and that over time it would even out to 50% each way?
     
  2. RAREROO

    RAREROO Overrun With Chickens

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    I believe that is correct. I think in humans and other mammles, the male determines the sex of the offspring and in birds the female determines the sex.

    Though I will say that once have had 5 barred rock hens that I was using to make black sexlinks with. First I was using a buff orp roo with them and was getting about half and half pullets and roos, then I switched to a RIR roo and only hatched a couple batches from him, but of the ones that hatched, all of them were pullets. But like I said, I'm pretty sure that in birds, it is the mother that determines the sex.
     
  3. FireTigeris

    FireTigeris Tyger! Tyger! burning bright

    The hen determines sex in birds (unlike mammals where the male does), they (the females) are the ones with the two different sex chromosomes.

    ZW sex-determination system is that the females have the ZW and the males have ZZ.
     
  4. starforever61

    starforever61 Chillin' With My Peeps

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    No, actually the rooster determines that. It works the same with them. I can guarantee that. [​IMG] The mother does not guarantee the gender. It's all up to the daddy.
     
  5. SunChick

    SunChick Chillin' With My Peeps

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    Quote:Nope! In birds it is opposite of mammals. Females determine gender, they have the different sex chromosomes Z and W, one of each. Males have ZZ.

    Humans it is XX = Female and XY = male. Males in humans determine gender. What is true for one class of animals is not true for another. A lot of people assume what is true for humans must be true for all classes.

    A helpful link about species sex determination: http://biology.about.com/od/basicgenetics/p/chromosgender.htm
     
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  6. Chris09

    Chris09 Circle (M) Ranch

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    I also believe that the hen has a lot to do with what the sex of the offspring is going to be and also the hen puts a lot of "type" into the offspring also. Here is a link to a article about the "secret in the dam" and is titled "The Secrets in the Dam".
    http://bloslspoutlryfarm.tripod.com/id50.html

    Chris
     
    Last edited: Jun 26, 2010
  7. speckledhen

    speckledhen Intentional Solitude Premium Member

    The sex of the chick is determined by the hen, not the rooster. Avians are different than mammals.
     
  8. crazy chook

    crazy chook Chillin' With My Peeps

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    I guess then that I will be eating the light brown eggs and not incubating them! [​IMG]
     
  9. crazy chook

    crazy chook Chillin' With My Peeps

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    Quote:Thank you Chris that article is very informative.
     
  10. hallerlake

    hallerlake Chillin' With My Peeps

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    Quote:Nope! In birds it is opposite of mammals. Females determine gender, they have the different sex chromosomes Z and W, one of each. Males have ZZ.

    Humans it is XX = Female and XY = male. Males in humans determine gender. What is true for one class of animals is not true for another. A lot of people assume what is true for humans must be true for all classes.

    A helpful link about species sex determination: http://biology.about.com/od/basicgenetics/p/chromosgender.htm

    I learn something new every day. How fascinating.
     

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