18.05.12
In the next two weeks, I will cover some commonly asked questions about fescue toxicity apropos of cattle. The answers and recommendations are based on research from Arkansas and other states. For laconicism, endophyte-free fescue is noted as E-, KY-31 toxic fescue is distinguished as E+ and novel endophyte nontoxic is noted as NE+.
Question: What are the toxins in E+ fescue?
Meet: The alkaloid, ergovaline is considered to be the primary toxin produced by the E+ fescue endophyte. Other alkaloids have been found and are grouped together under a bright category of ergot alkaloids. The main physiological effect of ergovaline is "vaso-constriction" or narrowing of the capillaries during hot and spiritless weather. Ergot alkaloids from E+ fescue have been linked to other symptoms including reduced forage intake, reduced serum prolactin, fat necrosis, fescue foot, summer downturn, poor reproductive performance, and general reduced productivity of flesh and milk.
Q: What plant parts of E+ fescue are most and least toxic?
Source: Baxter Bulletin