[Yellow oat grass intoxication in horses: Pitfalls by producing hay from extensive landscapes? A case report].

This research article discusses a case of vitamin-D intoxication in horses due to their consumption of yellow oat grass. They observed that the hay, which was 50% contaminated with yellow oat grass, led to symptoms including loss of appetite, weight loss, colic, and excessive drinking and urine production in horses.

Background

• The study examines a syndrome known as “enzootic calcinosis”, commonly linked with Vitamin-D intoxication in livestock, particularly from the consumption of yellow oat grass (Trisetum flavescens).
• Trisetum flavescens, a type of grass prevalent in the upper regions of the Alps, is known to induce calcification in soft tissues like vessels, tendons, ligaments, lung, heart, and kidneys in ruminants and horses.
• However, reports of yellow oat grass intoxication in horses have been limited until now.

Key Findings

• The researchers provide a detailed case study of Vitamin-D intoxication occurring in a riding stable in Thuringia, Germany, where horses were fed hay contaminated with yellow oat grass.
• The symptoms observed in the horses included a reluctance to eat, substantial weight loss, colic, and polydipsia (excessive thirst) and polyuria (increased urine production).
• The hay provided to the horses was derived from an extensively cultivated landscape and was found to be contaminated with 50% of Trisetum flavescens. This hay production was conducted according to the European Fauna-Flora-Habitat (FFH)-directive.

Potential Risks and Considerations

• The report underlines the dangers that come with the production of hay from extensively used landscapes.
• There is also an exploration of the peculiarities surrounding Vitamin-D metabolism in horses, implying that specific nutritional strategies and management practices might be necessary to prevent similar cases of intoxication in the future.