Abstract
Various levels of Mo and Cu were added to practical starting rations for chicks and poults. Growth of chicks and poults was depressed by approx. 25% by addition of 300 ppm. Mo. Addition of Cu to the rations containing Mo caused slightly improved growth. There was no evidence of anemia or diarrhea in birds on the high-Mo diets. Poults fed high-Mo rations for over 4 weeks had normal feather pigmentation.