Publication Abstracts

Kimberly D. Gwinn, Henry A. Fribourg, John C. Waller, Arnold M. Saxon, and Marshall C. Smith. 1998. Changes in Neotyphodium coenophialum Infestation Levels in Tall Fescue Pastures Due to Different Grazing Pressures. Crop Science 38:201-204.

Based on the authors' knowledge, this is the first study that documents a direct relationship between changes in endophyte infestation level and grazing pressure. This research has immediate implications for designing pasture management systems that might include various stocking densities and tall fescues of different endophyte infestation levels.

H. A. Fribourg, J. C. Waller, R. J. Carlisle, R. J. M. Hay, L. R. Fletcher, H. S. Easton, and G. C. M. Latch. 1997. Tall Fescue from Down Under. Tennessee Agri Science 184:14-17.

Evaluation of two tall fescues, one with a novel endophyte, from New Zealand grown at Ames Plantation during 1994-97 under normal climatic condition, with good cultural and animal management and at medium stocking densities led the authors to three primary conclusions and/or observations:

  1. These fescues are not well adapted in the southwesterly portion of the tall fescue range in the United States.
  2. The presence of the novel endophyte imparted some stress tolerance to its host, resulting in measurably better, though still thin, stands.
  3. Novel endophytes, producing little ergovaline and hence resulting in few detrimental effects on consuming herbivores, may play an important role in escaping tall fescue toxicosis in the future.

J. C. Waller, H. A. Fribourg, K. D. Gwinn, and R. J. Carlisle. Effect of Grazing Pressure on Incidence of Neotyphodium coenophialum in Tall Fescue Pastures. Poster Presentation. American Society of Animal Science, July 29, 1998, Denver, Colorado.

Based on research conducted at the Ames Plantation in west Tennessee as part of a cooperative program between the Hobart Ames Foundation and The University of Tennessee Agricultural Experiments Station, the following graphic illustrates the Results and Discussion section of the poster:

Chart Copy

The authors provided the following Conclusions as a result of these research findings:

Changes in E+ level have been ascribed by some to contamination or environmental stress. We believe that grazing pressure and neither environmental stress nor contamination were the primary stresses and resulted in the changes in E+ levels for several reasons:

1. changes occurred only in pastures with moderate or high grazing pressures (GP); pastures with low GP did not change significantly 
2. there were no periods of extended drought and environmental conditions did not differ among pastures 
3. extreme precautions were taken to eliminate contamination of E- pastures with E+ seed or rhizomes 
4. although viable seed in animal feces can be a source of significant contamination when animals are transferred from pastures with high E+ levels to those with low E+, contamination was eliminated by feeding animals a non-fescue forage for at least 3 days prior to transfer to experimental pastures.