12/10/2026
🐴 ANNUAL RYEGRASS TOXICITY (ARGT) IN WA – WE NEED YOUR INPUT! 🌾
The WA Horse Council is supporting an important new research project by the Department of Primary Industries and Regional Development (DPIRD), investigating the impact of Annual Ryegrass Toxicity (ARGT) on livestock owners and hay producers across Western Australia.
ARGT is a serious and potentially fatal condition affecting horses, cattle, sheep and other grazing animals. It occurs when animals consume pasture or hay containing annual ryegrass infected with a toxin-producing bacterium.
For horse owners, the consequences can be devastating.
⚠️ What should horse owners know?
ARGT can cause muscle tremors, staggering, incoordination, increased sensitivity to stimuli, seizures and, in severe cases, death.
Importantly, infected ryegrass remains toxic even when dried and made into hay. There is no specific antidote, making prevention, feed testing and early recognition particularly important.
Always ask for ARGT testing information when purchasing hay. If you suspect ARGT, remove access to the suspect feed and contact your veterinarian immediately.
🔬 WHY IS DPIRD CONDUCTING THIS RESEARCH?
DPIRD wants to better understand where ARGT is occurring, its impact on livestock owners and hay producers, how people manage the risks, and what additional information, testing and support would be most useful.
📋 WE ENCOURAGE ALL HORSE OWNERS TO COMPLETE THE SURVEY!
Whether you have experienced ARGT firsthand, had concerns about contaminated hay or pasture, or have never encountered the condition, your feedback matters.
The survey takes approximately 10 minutes, responses are anonymous, and a limited number of free ARGT test kits are available.
👉 Complete the survey here:
https://www.dpird.wa.gov.au/businesses/pests-weeds-and-diseases/animal-pests-diseases/annual-ryegrass-toxicity/
PLEASE SHARE THIS POST! 🐴
We encourage horse owners, riding clubs, trainers, breeders, veterinarians, hay suppliers and livestock producers throughout WA to participate and share the survey through their networks.
The more information DPIRD receives from the horse community, the better it can understand our experiences and develop practical strategies for prevention, management and future support.
Your experience could help protect horses and other livestock across WA.
WA Horse Council – Advocating for horse welfare and the wider equine community since 1984.
Annual ryegrass toxicity (ARGT) is a potentially fatal poisoning of livestock after consuming annual ryegrass infected by the bacterium Rathayibacter toxicus (formerly known as Clavibacter toxicus). All grazing animals are susceptible to ARGT, including sheep, cattle, horses and pigs.