Optical flow patterns in broiler chicken flocks as automated measures of behaviour and gait

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Optical flow, flock behaviour and chicken welfare (2012, background): “In broiler chickens, flocks with a high percentage of individuals with abnormal walking behaviour have been shown to have a lower mean flow rate than flocks made up of normally walking individuals (Dawkins et al. 2009), a finding confirmed experimentally by Aydin et al. (2010).”
In search of the behavioural correlates of optical flow patterns in the automated assessment of broiler chicken welfare (2013, methodology): “Birds with poor gaits walk more slowly than birds with better gaits (Dawkins et al., 2009; Caplen et al., 2012) and so a flock with a high % of birds with poorer gaits would be expected to have an overall lower mean rate of movement than a healthy flock.”