Chickens were visually inspected individually for
twisted legs, crooked toes and valgus and varus
deformities at 41 and 46 d of age in broiler
Experiments 1 and 2, respectively. Valgus angular
deformities were combined with varus malaligments
because of the low prevalence of varus in
the broiler flock. Walking ability was evaluated
following the gait-scoring system defined by
Webster et al. (2008). The gait scores (GSs) from
this 3-point system used were as follows: GS 0:
birds can walk at least 1.5 m with a balanced
gait. Birds may appear ungainly but with little
effect on function. GS 1: birds can walk at least
1.5 m but with a clear limp or decidedly awkward
gait. GS2: birds will not walk 1.5 m and may shuf-
fle on shanks or hocks with the assistance of wings.