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Fertilization-males vs females ratio

post #1 of 4
Thread Starter 
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.
post #2 of 4

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.

NPIP 43-813

“Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts.

Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime.”                  Mark Twain

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NPIP 43-813

“Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts.

Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime.”                  Mark Twain

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post #3 of 4
Thread Starter 
Wow, I had no idea! Thanks for the links!
post #4 of 4

Then, there are a few of us who are experimenting with this issue.  I started a thread on the subject this spring, and had what I considered to be a reasonably good outcome:  http://www.backyardchickens.com/t/958517/nutrition-and-gender-and-inducing-broodiness

Jesus Christ is my pilot.

My husband of 41 years is my best friend and co-pilot.

Enjoying my gardens.  My flock are my garden helpers.

Breeding a winter hearty flock with small combs and colored eggs.

Favorite breeds:  Dominique and EE.  Hatching addict.

 

http://www.backyardchickens.com/t/1084432/egg-gender-selection-survey

http://www.backyardchickens.com/t/1013154/byc-member-interview-laz...

Reply

Jesus Christ is my pilot.

My husband of 41 years is my best friend and co-pilot.

Enjoying my gardens.  My flock are my garden helpers.

Breeding a winter hearty flock with small combs and colored eggs.

Favorite breeds:  Dominique and EE.  Hatching addict.

 

http://www.backyardchickens.com/t/1084432/egg-gender-selection-survey

http://www.backyardchickens.com/t/1013154/byc-member-interview-laz...

Reply
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