| Autor: |
Futrell, M. C., Farnell, D. R., Poe, W. E., Watson, V. H., Coats, R. E. |
| Zdroj: |
Journal of Environmental Quality; April 1974, Vol. 3 Issue: 2 p140-143, 4p |
| Abstrakt: |
The fungal population of the rumen of fistulated steers grazing fescue (Festuca arundinaceaSchreb.) was studied in 1972 and 1973. Aspergillus terreusThom was found in 1972 in the rumen shortly after the steers were placed on fescue pastures. Populations of this fungus increased in 6 weeks from 0 to over 1000 propagules per gram of rumen fluid. One month after the steers were placed on this pasture, fescue toxicosis occurred. Aspergillus terreuswas not found in the rumen of fistulated steers grazing fescue in 1973, and no fescue toxicosis developed in these steers. Fusarium tricinctum(Cda.) Sacc. and other fungi were found in both years but not in high populations as was A. terreus. In 1972 A. terreuswas isolated from fescue in four different counties in Mississippi where fescue toxicosis was found. In 1973 no A. terreuswas isolated from these same fields and no fescue toxicosis occurred. Higher numbers of propagules of A. terreuswere found in 1972 in fescue growing on low nitrogen. Two out of three fistulated steers artifically dosed with A. terreusand grazing fescue in 1973 developed swollen and tender feet, symptoms of fescue toxicosis. Aspergillus terreusremained viable through the entire digestive tract of these three steers in 1973. |
| Databáze: |
Supplemental Index |
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