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Already spoke(email) with Juststruttin, she has nothing right now but a great dea on some 1& 2 year old stock she wishes to move on. :( Thanks though. My best option at the moment seems to be Cacklebery Hatchery in Modesto.
 
dretd said:
Yep. I kinda am pretty well versed on sciency stuff. I must have not communicated very well. I am not talking about temperature-dependent sex selection in reptiles, I am talking about the hen producing eggs that are either male or female and possible environmental influences that will cause the expected even ratio of males: females to be skewed one way or another.

You can see some of the hypotheses as to why this documented phenomenon might occur here: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2606724/ (I can dig up more papers if you are interested)

Here is a summary of a study from 2011 http://www.thepoultrysite.com/artic...offspring-sex-ratio-in-white-leghorn-chickens :
"Treatment of hens with a high dose of corticosterone five hours prior to ovulation resulted in the production of 83 per cent male offspring. This result is the opposite of that expected, because work in other avian species has shown that long-term treatment stimulates a female-bias. The Georgia researchers explained, however, that their experiment differed from previous work in that they provided a single, higher short-term dose, which could explain why the results differed in direction..."

So to sum up previous research: chronic low levels of the stress hormone corticosterone appears to increase the production of female (W-) eggs and lead to a pullet-heavy hatch, whereas a higher level of corticosterone given as a pulse 5 hours before ovulation resulted in more male (Z-) eggs to be produced and a cockerel-heavy hatch.

I am wondering if I can identify any environmental factors that will influence the sex ratio of the hatch. If I knew, for instance, that a low pressure front moving through would spike corticosterone in my hens high enough to cause them to release more male eggs, then I would avoid setting eggs laid under those conditions. If I knew that moving the hens to a 'ladies retreat' (advocated by WHMarans) caused a low-level increase in corticosterone and that the hens produce more female eggs for a few days until they settle in (it worked for her) then I might be inclined to move my hens to an auxiliary pens once a month and collect eggs from them for that week only.

Looking at my hatch, it had an overall ratio of 5:6, so it had the expected evenly split girl:boy ratio. It wasn't until I looked further and saw that there appeared to be a cluster of females at the start and males at the end that I thought I should investigate the findings in additional hatches, and also was wondering if any other breeders note the lay order of their chicks and their sexes to see if they have noted any clusters around dates within the collection period.

The one thing to keep in mind is that the egg was ovulated about 22 hours (give or take) before it is laid and thus events need to be looked at on the day before the egg ends up in the nest as there is a lag.
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No that's ok. I used to work for the 800 pound monster of scholarly publications and still have access to PubMed as well as most of my friends either work at NIH or Johns Hopkins. So I have been doing my own poultry research for birds with the FM gene (Svart Hona, Ayam Cemani, Ayam Kedu, Kadaknath, etc.). But since I can't possibly keep hundreds of roosters from these breeds, I originally went looking for a scientific way to manipulate the sex of poultry. Based upon the papers I was able to find in peer-reviewed journals (discarding non-vetted papers), I was able to conclude that sex cannot be manipulated. However, you can negatively affect the hatching rate of males by increasing temperature a degree. Not sure I want to test it with my expensive breeds but I may just do that.

But please post your results. I am sure those of us. that end up with lots of CL boys would be interested in trying to recreate you results. I have been fortunate enough to find homes for every CL boy that hatches at a farm. But what happens when they stop taking them? I don't have that kind of space.
 
DCchicken said:
No that's ok. I used to work for the 800 pound monster of scholarly publications and still have access to PubMed as well as most of my friends either work at NIH or Johns Hopkins. So I have been doing my own poultry research for birds with the FM gene (Svart Hona, Ayam Cemani, Ayam Kedu, Kadaknath, etc.). But since I can't possibly keep hundreds of roosters from these breeds, I originally went looking for a scientific way to manipulate the sex of poultry. Based upon the papers I was able to find in peer-reviewed journals (discarding non-vetted papers), I was able to conclude that sex cannot be manipulated. However, you can negatively affect the hatching rate of males by increasing temperature a degree. Not sure I want to test it with my expensive breeds but I may just do that.

But please post your results. I am sure those of us. that end up with lots of CL boys would be interested in trying to recreate you results. I have been fortunate enough to find homes for every CL boy that hatches at a farm. But what happens when they stop taking them? I don't have that kind of space.
Click to expand...
ok, I have to ask, 800 pound monster...is named what?

I am happy to post as I go but I doubt you would find it of interest since it will only be reviewed by my peers on BYC--and I don't think that counts
smile.png
 
Aloha,

So in Chickens, itʻs the female who carries the X and Y chromosomes? Interesting.

Also, the possibility that low stress can cause more females to hatch? Couldnʻt hurt. My 3 girls live with a bunch of young teenagers that probably drive them crazy. But it is what it is. Better than living with the mean ladies up above.

Maybe I should put pineapple umbrellas in their water.

Aloha, Puhi
 
dretd said:
ok, I have to ask, 800 pound monster...is named what?

I am happy to post as I go but I doubt you would find it of interest since it will only be reviewed by my peers on BYC--and I don't think that counts
smile.png
Click to expand...
my unrefined data -

my last hatch was ALL BOYS, and overall my hatches seem to be weighted towards boys.

Since that hatch, one CL hen went broody, and I collected the eggs of only 2 other CL hens, which are now in the incubator.
They all occupied the same space, with the same rooster, and all the general impacts (including a hawk attack - although a different hen suffered the actual attack).

I'd love to break the house odds, the weather odds, and anything else out there that says more boys...

btw - cute chicks dretd, thanks for posting pics =) I'm always surprised to hear of aggressive CL roosters.
 
DCchicken said:
. You will need to hatch hundred of chicks using the same hens and roosters for valid data. If you log all of the data, it should be a good paper to write.
Click to expand...
Guess what.... IMO if you KNOW the hen and the rooster (and I'm not sure he really is a factor if the hen determines the sex of the chicks -- it's her results I would want to track...) -- You may not need to hatch 100 to know if there is a bias toward males or females.....

Just lately - my hen has hatched -- 7 females to one male --
When I first started hatching from her...Her first hatch was 4 females and 2 males, her second hatch 2 of each. I think there is a slight bias to produce pullets....


In humans isn't it the older the parents the more likely the child will be a girl - any age factors ever noted in chickens??
 
Hi, everyone. Please forgive me for this, but I am just learning about cream legbars and totally in love with them. I know they are autosexing, but I just don't know which one is which. Im sure this has been asked before, but I'd appreciate it if someone could post pics for me. And if there is anyone in the savannah area with some available....
 

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