What are the odds I have all roos

[Quail_Cottage]

I was starting to get worried about my hatches too. First dozen eggs....3 roos 1 hen. Next batch 21/31 hatched....looking more promising, 9 browns and looks like 7 hens 2 roos but they are only two weeks old so still hard to tell and the rest I have 9 whites, 3 tibetans so I can't tell with those. couple of the whites seem to be crowing and one of the tibetans. Hopefully they'll help even out my numbers

 

[JJMR794]

Quote:
You mean like reptile eggs--- temperature determines or at least influences sex development of the embryo? Not sure if thats possible with quail or any bird for that matter, unfortunately i have never looked into it...

David what'd ya got on that 1?

 

[optic1]

Effects of estrogens on sex differentiation in Japanese quail and chicken.

Estrogen production by the female avian embryo induces development of a female phenotype of the reproductive organs whereas the low estrogen concentration in the male embryo results in a male phenotype.

U.S. National Library of Medicine

Recent studies have shown that some species of birds have a remarkable degree of control over the sex ratio of offspring they produce. However, the mechanism by which they achieve this feat is unknown. Hormones circulating in the breeding female are particularly sensitive to environmental perturbations, and so could provide a mechanism for her to bias the sex ratio of her offspring in favour of the sex that would derive greatest benefit from the prevailing environmental conditions.

I KNEW IT, IT'S THE WIND!!!!!!

 

[ArizonaNessa]

Quote:
You mean like reptile eggs--- temperature determines or at least influences sex development of the embryo? Not sure if thats possible with quail or any bird for that matter, unfortunately i have never looked into it...

David what'd ya got on that 1?

I don't know for fact but seems to me if you could create the desired sex by temps then hatcheries wouldn't have issues with too many males. Some scientist out there somewhere would have figured it out and the situations in hatcheries wouldn't be as they are today. Just my thoughts there.

 

[optic1]

Another study said they do manipulate coturnix

Here, we present details of an experiment in which we manipulated levels of testosterone, 17β-oestradiol and corticosterone in breeding female Japanese quail (Coturnix coturnix japonica) using Silastic implants and looked for effects on the sex ratio of offspring produced. Offspring sex ratio in this species was significantly correlated with faecal concentrations of the principal avian stress hormone, corticosterone, and artificially elevated levels of corticosterone resulted in significantly female-biased sex ratios at laying.

Our results suggest that corticosterone may be part of the sex-biasing process in birds.