Cc. Whitehead et al., DEFECTIVE DOWN-SYNDROME IN CHICKS IS NOT CAUSED BY RIBOFLAVIN DEFICIENCY IN BREEDERS, British Poultry Science, 34(3), 1993, pp. 619-623
1. Riboflavin-deficient practical and semi-purified diets were fed to
broiler breeder hens. 2. Yolk and albumen riboflavin concentrations we
re depressed by the deficient diets and cases of curled toes were seen
in the chicks. 3. The few instances of defective down did not resembl
e cases seen in field outbreaks of a condition involving depressed hat
chability and a defective down syndrome. 4. It is concluded from obser
vations in this experiment and in the field outbreaks that there is a
condition in breeding chickens causing depressed hatchability and defe
ctive down that is not attributable to riboflavin deficiency.