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Okay, I just skimmed this article and didn't see that sentence. I may have just missed it, it may have been removed. I did read at the beginning "This article needs attention from an expert on the subject. See the talk page for details. WikiProject Birds or the Birds Portal may be able to help recruit an expert. (September 2009)" so maybe some smart BYCers could contribute to this article.
I agree that if it were possible to know which eggs would hatch pullet chicks then the egg industry as well as commercial hatcheries would put this into practice. What I think is that since it's the hen who determines the sex of the chick, and since most hens lay the same types of eggs, similar in size, color & shape, and that some hens tend to make more of one sex than the other, then perhaps there have been some hens with a preponderance of pullet chicks laying distinctly rounded eggs. And if you collected & hatched those eggs, you'd tend to have more pullets hatch.
The best way to test this theory would be to incubate ONLY rounded, or pointed eggs in one clutch, and later see how many were of which sex.
Okay, I just skimmed this article and didn't see that sentence. I may have just missed it, it may have been removed. I did read at the beginning "This article needs attention from an expert on the subject. See the talk page for details. WikiProject Birds or the Birds Portal may be able to help recruit an expert. (September 2009)" so maybe some smart BYCers could contribute to this article.
I agree that if it were possible to know which eggs would hatch pullet chicks then the egg industry as well as commercial hatcheries would put this into practice. What I think is that since it's the hen who determines the sex of the chick, and since most hens lay the same types of eggs, similar in size, color & shape, and that some hens tend to make more of one sex than the other, then perhaps there have been some hens with a preponderance of pullet chicks laying distinctly rounded eggs. And if you collected & hatched those eggs, you'd tend to have more pullets hatch.
The best way to test this theory would be to incubate ONLY rounded, or pointed eggs in one clutch, and later see how many were of which sex.