Biotin is a B vitamin called B7, B8 in the past and even Vitamin H.

Biotin deficiency affects the functionality of a number of carboxylase enzymes involved in cell regeneration processes of tissues with a fast restoration as skin and intestinal, reproductive and respiratory mucosa,so these may acquire a cracked look and turn vulnerable to the attack of pathogenic agents such as viruses, bacteria and parasites.

The lesion shown in the picture can be seen frequently accompanied by plantar lesions in birds, especially in broilers.