I found and interesting tidbit on the internet tonight at
http://articles.extension.org/pages/65471/sex-linked-traits-in-poultry
I was trying to figure out that woman's chicks that died. The ones we had the Mericks discussion about. She send me a message the one crippled one died. The other is doing no better..
She got some CLB's from me in April and they are doing great. Same parents as the ones she got in July where all but one of the girls has died and the boys are doing fine. Same feed, same parents, same pen and only they died.
So I decided to see if there were any Sex linked diseases like hemophiliac in humans is. I did not find anything.
But I found this that blows a hole in the sexing by wing feathers between two and 4 days. As I read it, it will depend on which parent has the fast feathering or slow feathering gene. If the mother has it the boys will feather faster, if the father has it the girls will feather faster. SO we are back to the pin on a string. or the "Ivie method" as I like to call it.
Examples of Sex-Linked Crosses Used in Production of Meat Chickens
The speed of feather growth is a sex-linked trait used for sexing day-old broiler chickens. Slow feathering in chickens is caused by a gene on the Z chromosome. The difference in the length of the primary and covert wing feathers can be seen between one and three days after hatching. After this age, however, it is not possible to use this sex-link cross for sexing chickens. When slow-feathering females are crossed with fast-feathering males, the male offspring are slow-feathering like their mother, and the female offspring are fast-feathering like their fathers.
Figure 1. Comparison of the wings of fast- and slow-feathering chicks. Source: Jacquie Jacob, University of Kentucky
http://articles.extension.org/pages/65471/sex-linked-traits-in-poultry
I was trying to figure out that woman's chicks that died. The ones we had the Mericks discussion about. She send me a message the one crippled one died. The other is doing no better..
She got some CLB's from me in April and they are doing great. Same parents as the ones she got in July where all but one of the girls has died and the boys are doing fine. Same feed, same parents, same pen and only they died.
So I decided to see if there were any Sex linked diseases like hemophiliac in humans is. I did not find anything.
But I found this that blows a hole in the sexing by wing feathers between two and 4 days. As I read it, it will depend on which parent has the fast feathering or slow feathering gene. If the mother has it the boys will feather faster, if the father has it the girls will feather faster. SO we are back to the pin on a string. or the "Ivie method" as I like to call it.
Examples of Sex-Linked Crosses Used in Production of Meat Chickens
The speed of feather growth is a sex-linked trait used for sexing day-old broiler chickens. Slow feathering in chickens is caused by a gene on the Z chromosome. The difference in the length of the primary and covert wing feathers can be seen between one and three days after hatching. After this age, however, it is not possible to use this sex-link cross for sexing chickens. When slow-feathering females are crossed with fast-feathering males, the male offspring are slow-feathering like their mother, and the female offspring are fast-feathering like their fathers.
Figure 1. Comparison of the wings of fast- and slow-feathering chicks. Source: Jacquie Jacob, University of Kentucky
