Pyrrolizidine alkaloidosis in a two month old foal.

This research paper details a case of congenital pyrrolizidine alkaloidosis in a two-month old foal, where the foal contracted chronic liver damage due to its mother’s consumption of a toxic plant containing pyrrolizidine alkaloids during pregnancy.

Introduction and Methodology

• The researchers examined a case involving a two-month old foal, which had been small and jaundiced from birth and eventually succumbed to chronic hepatic or liver damage.
• This damage was characterized by fibrosis or tissue thickening, biliary ductular hyperplasia or an abnormal increase in bile duct cells, and the presence of pleomorphic hepatocytes, which are liver cells that contain either a single large nucleus or multiple nuclei.
• The researchers determined the cause of this damage by noting that the fixed liver of the foal contained sulfur-bound pyrroles, substances derived from pyrrolizidine alkaloids – toxic compounds that can cause liver damage in animals and humans.

The Role of Senecio madagascariensis

• During the foal’s gestation period, the pasture was heavily infested with the pyrrolizidine alkaloid-containing plant, Senecio madagascariensis.
• This plant is known for its high content of pyrrolizidine alkaloids, which when ingested by animals, can lead to major health issues including liver damage.

Discussion

• Based on this evidence, the researchers concluded that the hepatic disease affecting the foal appears to have been initiated by the consumption of the pyrrolizidine alkaloids by the mare during pregnancy.
• This is a rare incidence of a condition known as congenital pyrrolizidine alkaloidosis, where the foal inherited liver damage from its mother due to her ingestion of a toxic plant during pregnancy. This demonstrates the risks certain plants, especially those containing pyrrolizidine alkaloids, can pose to livestock health, even before birth.