The Effect of Rust (Uromyces viciae-fabae) on Dry Matter Degradability, and Nitrogen, Phosphorus and Crude Protein Contens of Lentil.
2007
Negussie Tadesse and Pretorius, Z.A. and Yalemshet W/Amanuel
In Ethiopia, a significant amount of lentil straw and pod are fed to livestock whether it is infected by rust (Uromyces viciae-fabae) or not. Little is known about the effect of rust on nitrogen (N), phosphorus (P) and crude protein (CP) content of lentil. Hence, chemical analysis was undertaken to assess these constituents in straw and seed of lentil from five treatments with varying degrees of the disease. Rumen degradability profiles and chemical analysis of lentil straw with varying severity of rust were evaluated to elicit influence of rust on straw quality. An exponential model was fitted to calculate rumen degradability of dry matter. Following 6 ha of incubation, samples of all treatments lost 40% of the total dry matter, degradation reaching 65% at 72 ha. Rust did not significantly (P 0.05) decrease degradability of dry matter in the rumen. However, the wash value of dry matter of straw from maximum rust infection was significantly (P 0.05) higher compared to the others tested in this study. Straw from plants with maximum rust infection had significantly (P 5 0.05) higher N, P and CP contents than straw from healthy plants. The seed P content of healthy plants tended to be significantly (P . 0.05) higher than that from rust infected plants. The rust had no significant (P 0.05) effect on seed nitrogen content.
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