Replicated 7.3-ha pastures of each treatment were grazed by cow- calf pairs (16 pairs per pasture replication) each year from March to weaning in September. A 3-yr grazing study was conducted to compare effects of AR542-infected tall fescue pastures with wild type endophyte-infected (E+) tall fescue pastures on cow- calf performance. The nonergot alkaloid-producing endo-phyte, AR542, has been shown to improve the persistence and yield of tall fescue pastures without causing the animal disorders commonly associated with tall fescue toxicosis. Watson, R H McCann, M A Parish, J A Hoveland, C S Thompson, F N Bouton, J H Productivity of cow- calf pairs grazing tall fescue pastures infected with either the wild-type endophyte or a nonergot alkaloid-producing endophyte strain, AR542.
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