PSXIII-4 Effects of Keel Bone Fracture on Behavioral Fear Responses of Laying Hens in the Late Laying Period

Abstract Keel bone fracture (KBF) of laying hens has become one the important welfare problems for health and production performance. The present study aimed to assess fear responses in native breed Lindian chickens commercial Hyline Brown with without KBF at late period. At their 56-week-age, a total 76 80 selected from furnished cages were housed individually battery cages. divided into normal group keel group. tests, including tonic immobility tests (TI), open field (OFT), startle reflex (SRT) measured sequentially. fractured two had significant elevated duration time TI test than that (P < 0.05). In OFT test, number grids, steps, spent outer ring significantly less those 0.05), inner was greater movement latency circle but grids steps passed There no difference call between strain > score Therefore, reduced later stage by affecting behavioral responses.