] suggested that
underlying fearfulness predisposes laying hens to exhibit feather
pecking. By investigating the hens divergently selected for feather
pecking, Kjaer and Jørgensen [23] found the greatest decrease in LF
and HF from basal to during stressful situation in birds from the
high feather pecking lines compared to the low feather pecking
lines and the controls. In human medicine, Dale et al.