Endophytes in Perennial Ryegrass and Tall Fescue Straw

Nutrition Update
Volume 11 No.3, February 2001

The use of turf-type perennial ryegrass and tall fescue as livestock feed can result in health problems. The presence of endophytes is beneficial to the plants but feeding straw, screenings or grazing infected pastures is known to cause fescue foot (fescue toxicosis) and ryegrass staggers in cattle, sheep and horses. Turf-type varieties can contain high levels of two alkaloids - ergovaline (in tall fescues) and lolitrem B (perennial ryegrass). Safe feeding levels of the two toxins are shown below and have been determined through work at Oregon State University. The Oregon State University testing lab is one of very few places that analyzes for these toxins.

Testing of straw, straw and chaff, and chaff was done by Manitoba Agriculture and Food in 2000. Results of a limited number of tall fescues showed ergovaline levels less than 20 ppb. Lolitrem B levels in tall fescue exceeded 2000 ppb in 8 of the 10 samples analyzed.

For additional general information, as well as feeding recommendations, please refer to the MAFRI factsheet entitled "Endophytes in Perennial Ryegrass and Tall Fescue Straw."

 

For More Information contact your Local Specialist or MAFRI GO Teams Office or Centre.