Turns out Dan’s grandfather, the chicken sexer, had to determine the sex of day old chicks by feeling something in their cloaca. He had to grow his fingernail in some special way to do so. OG robotic prosthetics.
https://layinghens.hendrix-genetics.com/en/articles/color_sexing-in-day_old_chicks/
” For color sexing, we make use of the principle of sex-link crosses. Sex-link crosses (hybrid chicken breeds) involve the crossing of two different breeds of chickens to get offspring that can be sexed at hatch by differences in down color. For example, mating Rhode Island Red males with Rhode Island White females. Their offspring will consist of yellow/white colored day-old male chicks, and brown colored day-old female chicks (as always, exceptions are there). Based on the color of the down, the day-old chicks can easily be sorted by sex.
The most common sex link crosses are the red sex link. Close to half of the global chicken population consists of red sex link chickens. Our common brown breeds (ISA Brown, Shaver Brown, Bovans Brown, Babcock Brown, Hisex Brown, Dekalb Brown and Warren) are all red sex link crossbreds.
Please note: this trait does not breed true and breeding two sex linked commercial chickens (hybrids) will not produce offspring that can be sexed at hatch.
Color sexing female day-old chicks
Female day-old chicks have uniformly brown colored down, or brown with a light stripe in the middle of the back.
The following common exceptions can be found: female day-old chicks that have a broad yellow stripe with brown edging on a somewhat lighter background, or female day-old chicks that have a brown colored head with a lighter body.
Color sexing male day-old chicks
Male day-old chicks are yellow/white or show slight brown stripes.
Exceptions can be found: day-old male chicks that have distinct yellow/light stripes with brown borders, or day-old male chicks that have a dark brown stripe in the middle of their back.
Download the color sexing manuals
Poor cute babies are gonna get shredded 😢
“Disadvantages of Feather Sexing
Feather-sexing can only be carried out in chicks resulting from the mating of fast normal-feathering males with delayed-feathering females, while vent sexing can be applied to any chicks. This means that feather-sexing cannot be applied to chicks of the same breed, unless geneticists preserve that breed segregating for both types of feathering and birds are strictly controlled for feathering type.
The preparation of new breeds to produce feather sexable crosses implies considerable previous genetic work which is completely beyond the means of most poultry farmers.”
| Genotype | Phenotype |
|---|---|
| k+ or k+k+ | Fast feathering |
| K or KK | Slow feathering |
| Kk+ | Slow feathering males (K s is dominant over k+) |
Figure 1. Feathering types Diagram of the wing of a one-day-old chick in dorsal view: A fast normal-feathering with the primary remiges (1a) longer than the coverlets (2a). B sex-linked delayed feathering with the primary remiges (1a) of the same length than the coverlets (2a). C modified delayed feathering with the primary remiges. (1a) shorter than the coverlets (2a).
source: Wikiwand