Feed and feed supplement for swine and poultry. The feed comprises the feed supplement. The feed supplement consists essentially of at least one of a predetermined concentration of Capsaicin, a predetermined concentration of essential oil of Ocimum sanctum L., a predetermined concentration of fructo-oligosaccharide and a pre-determined concentration of Curcumin. Process or method for manufacturing the feed supplement is also provided. The feed supplement produces physiological effects in poultry and swine when consumed thereby. In poultry, the feed reduces cholesterol content of eggs produced, enhances immunity against Newcastle disease, reduces stress effects and increases excretion of digestive enzymes when consumed by the poultry. In swine, the feed enhances immunity against Swine fever disease, increases growth rate and feed conversion ratio and enhances carcass characteristics thereof.