Zinc deficiency during the post-weaning period is known to cause adverse health outcomes such as impairment of growth and diarrhea. Zinc supplement seems to critical in achieving positive growth responses, but a high dose of zinc is concerned to be toxic and cause a large amount of zinc excretion, resulting in environmental pollution. Thus, the purpose of this project is to investigate the effects of a lower dose of zinc supplement, coated zinc oxide, on growth performance and gut health in weanling animals.