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Abstract
1. The effect of various factors on the incidence of leg abnormalities, with particular reference to twisted leg, in broilers was studied.
2. The incidence of twisted legs was influenced by strain and for males was twice that for females. There was also a higher incidence in cages than on litter with the type of cage floor having an effect: broilers reared on floors of metal wire and perforated sheets had more leg problems than those reared on plastic mats and plastic‐covered wire.
3. Although vitamin and mineral supplementation had no effect on caged broilers, a restriction of metabolisable energy (ME) intake during the first 14 d after hatching halved the frequency of leg abnormalities compared with those fed ad libitum.
4. Studies of cage size and location of water suggested that a lack of exercise increases the incidence of leg abnormalities.
