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Incidence of congenital deformity of cervical spine in apparently normal, dead in the shell, full term chick embryos observed in commercial hatcheries
| Item | Unhatched eggs examined | Dead in shell embryos showing signs of cervical scoliosis and torticollis |
|---|---|---|
| North American studya | 2730 | 132 (4.8) |
| European studyb | 2360 | 93 (4.0) |
Numbers in parentheses indicate % examined
aStudy conducted in the province of Saskatchewan, Canada
bStudy conducted around Siedlce district, Eastern Poland
