Composition of cell walls and in sacco crude protein and organic matter degradation of alfalfa (Medicago sativa L.)
2006
Čerešňáková, Z.,Slovak Centre of Agricultural Research, Nitra (Slovak Republic) | Fľak, P.,Slovak Centre of Agricultural Research, Nitra (Slovak Republic) | Chrenková, M.,Slovak Centre of Agricultural Research, Nitra (Slovak Republic)
The aim of this work was to determine the changes of crude protein content and changes of cell walls content and their compositions in alfalfa during vegetation periods, and their effect on crude protein and organic matter degradability in the rumen. The rumen degradability was determined by using in sacco method. Alfalfa maturity was increasing cell walls content and its constituents (cellulose, hemicellulose and lignin) as well as decreasing crude protein content in every subperiod. The increase in neutral detergent fibre (NDF) was greater with increasing plant maturity in spring than in summer months. Currently, lignin share of NDF content increased from 13.8 to 20.8 % within the 1st subperiod. This tendency was the same in all subperiods. There was observed significant decline of crude protein and organic matter effective degradability (EdgCP and EdgOM) with the content of NDF and its constituents (mainly lignin) between sampling in each subperiod. Significance between individual subperiods was observed only for EdgCP. It documents very high F-tests of the analysed parameters. All correlations and regression coefficients between NDF content (as well as its constituents) and EdgCP and EdgOM were statistically highly significant. The maximal correlation and regression were observed between EdgOM and lignin content (r sub(s) = -0.9256 and r = -0.8671). Dependence of EdgCP and lignin content is described by r sub(s)= -0.7927 and r = -0.6498.
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