Unless it is specified as one of the cultivars of endophyte free or novel endophyte, it's the normal endophyte enfected fescue. Some seed sources have hotter endophyte levels then others. When the seed is harvested they don't seperate/sort it by toxicity level. When we combined ours it all went into the same truck. Some was very hot the rest was less hot but still endophyte enfected.
If you keep it vegetive and don;t let it go to seed, that will decrease the effects of the endophyte. The easiest and most cost effective is to interseed a legume, either red or white clover. Just diluting the endophyte with clover is very effective at decreasing the fall slump or other effects of the endophyte. When we interseeded red clover at around 40% our weaning weights went up in the neighborhood of 50# per calve, and that was on drought pasture.
Your local university extension office or USDA NRCS office can also be a big help in the selection of your legume component.
dun