Fig. 1

Cases of skeletal deformity of the neck observed in commercial broilers. a Shows severe neck deformity in a newly hatched broiler chick. b Shows severe neck deformity in a broiler chick found in a commercial flock on day 3 after placing. c Shows neck deformity in a broiler found in a market age commercial flock. Notably, despite its profound anatomical changes, this bird survived in the flock throughout the production cycle and appeared to be in good health, but was approximately 40% smaller in comparison to normal broilers from this flock