Pantothenic acid, also called vitamin B5, is one of eight water-soluble B vitamins. Pantothenic acid is involved in many reactions like carbohydrate, fat and protein metabolism. In addition to the mentioned role, it is crucial for red blood cells manufacturing. Its deficiency is somewhat rare in chickens, since this vitamin is ubiquitously found in natural feed sources. The deficiency of this vitamin can cause reduced egg production, reduced growth and stunted feather growth in poultry flocks.