The relationship between the peck order and performance in a competitive group feeding situation by two groups of cockerel.
D000374:Aggression; D000818:Animals; D002645:Chickens; D003163:Competitive Behavior; D005247:Feeding Behavior; D005508:Food Deprivation; D006801:Humans; D008297:Male; D012930:Social Dominance; D012931:Social Environment