'Freedom from hunger' and preventing obesity: the animal welfare implications of reducing food quantity or quality

By Rick B. D'Eath, B. Tolkamp, I. Kyriazakis, A. Lawrence. 2009

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Optical flow patterns in broiler chicken flocks as automated measures of behaviour and gait (2009, background): “…and Decupere, 2008; Julian, 1998), lameness or difficulty in walking (Kestin et al., 1992; Sanotra et al., 2001; Bradshaw et al., 2002; Knowles et al., 2008) and obesity resulting in the need for feed restriction in the parent birds (Bessei, 2006; D’Eath et al., 2009; Renemam et al., 2007).”
Major welfare issues in broiler breeders (2011, methodology): “Numerous studies have shown that feed restricted broiler breeders show behaviours indicative of frustration, boredom and hunger, such as stereotypic object pecking, over-drinking and pacing (see De Jong and Jones, 2006 and D'Eath et al., 2009).”
Invited review: Effects of heat stress on dairy cattle welfare. (2017, background): “Appetite refers to the subjective desire to eat, whereas hunger is a negative affective state experienced by an animal that is unable to become satiated (D’Eath et al., 2009).”