Prior to foaling it is important to screen the mare for Neonatal Isoerythrolysis (NI), also known as “Jaundice Foal Disease”. An “NI Positive” mare is one that will produce antibodies in her colostrum that will attack the foal’s red blood cells once the foal has absorbed the antibodies. These antibodies were formed by the mare in response to exposure to a blood type different from her own. This can occur...