Grazing Novel or Endophyte-Infected Tall Fescue during Mid-Gestation Impacts Cow Performance

Consumption of endophyte-infected tall fescue results in poor reproductive performance. The objective of this study was to examine physiological changes in pregnant cows grazing tall fescue to develop a better understanding of the factors that contribute to the poor reproductive performance attributed to fescue toxicosis. Pregnant Angus and Simmental-Angus cows were blocked by age (2-3, 4-7, and >7 y), BW, and breed; and then randomly assigned to graze either novel (E-;