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Fertilization-males vs females ratio

Discussion in 'Incubating & Hatching Eggs' started by sonjap, Oct 21, 2015.

  1. sonjap

    sonjap Out Of The Brooder

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    Mar 16, 2012
    Parker, CO
    Hi all, this is my first year having a broody. I thought it would be fun to let her hatch some eggs. I have one rooster and I gave the hen eggs from several other hens as well. 9 hatched and I ended up with 6 roosters and 3 hens. I don't like that ratio too much!
    I was wondering if some Roos just have more Y sperm than X's, or was that just how it went this time around. If my hen goes broody again I'm not sure if I want to let her hatch again or if my ratio could be totally different next time.
     
  2. ChickenCanoe

    ChickenCanoe Chicken Obsessed

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    Birds are different than mammals in that the hen determines the sex. Instead of XY chromosomes, they have ZW chromosomes - as do some fish, reptiles and insects.
    Males are ZZ and females are ZW.
    Some interesting stuff on the topic.
    http://www.nytimes.com/2010/07/20/science/20chicken.html?_r=0
    http://onlinelibrary.wiley.com/doi/10.1111/j.1742-4658.2011.08032.x/pdf
    https://en.wikipedia.org/wiki/ZW_sex-determination_system

    Normally embryos become male or female at about a 50:50 ratio. Actually it's more like 45:55 but I can't remember which is more heavily weighted.
    Out of a dozen eggs, about every 80 times, they'll be all male or all female.
     
  3. sonjap

    sonjap Out Of The Brooder

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    Mar 16, 2012
    Parker, CO
    Wow, I had no idea! Thanks for the links!
     
  4. lazy gardener

    lazy gardener Chicken Obsessed

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    CENTRAL MAINE

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