The effect of dry matter content on the energy value of silages and organic matter digestibility
2001
Svetlanska, M. | Petrikovic, P. | Ceresnakova, Z. | Sommer, A. (Vyskumny Ustav Zivocisnej Vyroby, Nitra (Slovak Republic))
Different kinds of silages (n = 193) were examined for nutrient contents with special attention paid to crude fibre, NDF and ADF and the respective derived parameters of nutritive value. The values of dry matter, NDF and ADF concentrations as well as the values effective degradability of organic matter (EDg OM) varied according to the crop species and other numerous factors. For example the mean value of EDg OM in clover silages was 52 % whereas in maize silages and sugar-beet top silages it was 64 % and 80 percetn, respectively. The in vitro digestibility of organic matter (OM) in maize silages ranged from 52.4 % to 71.3 %. The increase in the content of crude fibre was followed by a decrease in OM degradability and digestibility. The following relations were valid for lucerne silages containing 40.1-50 % of DM: NEL (MJ/kg DM) = 5.982 - 0.003 ADF (g/kg DM), r2 = 0.774; NEL (MJ/kg DM) = 5.776 - 0.002 NDF (g/kg DM), r2 = 0.744. Whereas for grass silages containing 30.1-35 % of DM the relations were as follows: NEL (MJ/kg DM) = 7.674 - 0.006 ADF (g/kg DM), r2 = 0.870; NEL (MJ/kg DM) = 6.985 - 0.003 NDF (g/kg DM), r2 = 0.926.
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