A novel dietary supplement and methods for the manufacture and administration of the same are disclosed for feeding to equine mares and other animals prior to parturition to boost the colostrum immunoglobulin level in lactating equine mares and other animals and thereby enhance the passive transfer of immunity to neonatal equine foals and other neonatal animals. The dietary supplement of the present invention is effective in substantially increasing the level of colostrum immunoglobulins produced by mares and other animals, which is essential for the health of neonatal equine foals and other animals. The dietary supplement of the present invention consists of safe and natural ingredients rather than drugs, and is orally administrable. The ingredients of the dietary supplement of the present invention when combined provide a synergistic efficacy which greatly exceeds the sum of the efficacies of the individual ingredients, making the dietary supplement of the present invention highly effective in promoting the enhanced production of colostrum immunoglobulins in the equine mares and other animals.