The present invention relates to feed supplements comprising vitamins and canthaxanthin and the use of such supplements for improving performance and health in poultry, in particular in poultry pullets. It has been found surprisingly that feed additive compositions as hereinafter defined improves immune status, bone and skeletal development, flock uniformity, growth and feed conversion of pullets. The feed additive composition according to the present invention comprises canthaxanthin, at least one vitamin selected from the group consisting of vitamin C and vitamin E, a trace mineral, in particular selenium, and optionally a mixture of at least two compounds selected from the group consisting of thymol, eugenol, vanillin and γ-terpinene.
