Hoary alyssum (Berteroa incana) toxicity in a herd of broodmare horses.

The research article studies the harmful effects of hoary alyssum, a type of weed, on a herd of pregnant horses who ingested the plant. The horses developed severe symptoms which included digestive upsets and damage to the circulatory system, with some of the horses also experiencing late-term abortions.

Gastrointestinal Toxicity due to Hoary Alyssum Consumption

• The highlight of the research is the examination of the harmful effects of hoary alyssum consumed by a herd of pregnant horses. The horses developed acute gastrointestinal toxicity, a severe condition that affects the digestive system.
• The symptoms are indicative of severe digestive system malfunctions like indigestion, severe pain, nausea, and other complications, evidenced by the horses’ deteriorating health.
• The hoary alyssum plant toxins, when ingested, seem to significantly upset the horses’ digestive system leading to acute toxicity. This is the first such documented case which links hoary alyssum consumption to gastrointestinal symptoms in horses, specifically in broodmares.

Damage to the Circulatory System

• In addition to causing severe digestive issues, the consumption of hoary alyssum also led to intravascular hemolysis in the horses, a condition where the horses’ red blood cells were being destroyed while still inside the blood vessels.
• The state of intravascular hemolysis points to the possibility that the toxicity of hoary alyssum could affect the circulatory system as well, causing substantial harm over the exposure period.

Loss of Pregnancy in Mares

• Perhaps the most severe issue presented by the hoary alyssum toxicity in this study was the occurrence of late-term abortions in three of the studied horses, pointing to its perilous effects on reproductive health.
• The exposure to hoary alyssum toxicity could have led to major distress in pregnant mares which hampered their pregnancies, possibly due to the debilitating gastrointestinal symptoms, intravascular hemolysis, or an undisclosed pathway that adversely affected the health of the unborn foals.