Vitamin B2 functions as a coenzyme in reactions involving numerous oxidoreductases, collectively known as flavoproteins, which are key elements for the transfer of hydrogen atoms. Thus, like other Vitamin B complex, Vitamin B2 acts as a coenzyme in the metabolism of proteins, fats, and nucleic acids. It also participates in the visual process. Animal feeds, especially dairy products such as whey powder and skimmed milk powder, are rich in Vitamin B2. Alfalfa meal and feed yeast are also good sources of Vitamin B2. Grains, milling by-products, root crops, and plant protein feeds contain lower levels of Vitamin B2. Vitamin B2 deficiency can lead to growth retardation, poor feed utilization, and diarrhea. In chickens, it results in the characteristic symptom of curved toes.