In vitro ruminal fermentation of low-quality forages as influenced by the treatment with exogenous fibrolytic enzymes
2007
Giraldo, L.A.; Carro, M.D.; Ranilla, M.J.; Tejido, M.L., Universidad de León (Spain). Departamento de Producción Animal I | Giraldo, L.A., Universidad Nacional de Colombia, Sede Medellín (Colombia). Facultad de Ciencias Agropecuarias | Mohamed, A.H., Animal Production Research Institute Giza (Egypt)
The effects of three fibrolytic enzymes on the in vitro ruminal fermentation of five low-quality forages (three cereal straws (barley, wheat and rice), corn stover and grass hay) were investigated using batch cultures of mixed ruminal microorganisms. Four different treatments were investigated: no additive (control; CON), cellulase from Aspergillus niger (CEL; Fluka Chemie GmbH), xylanase from ruminal microorganisms (XYL; Megazyme International Ireland Ltd), and a 1:1 mixture cellulase:xylanase (MIX). Enzymes were applied directly onto the forages 24 h before incubation with buffered ruminal fluid at 39 degrees C for 24 h. The treatment with CEL increased gas production after 24 h of incubation for wheat straw, barley straw and grass hay, whereas the treatment with MIX and XYL did not affect gas production for any forage. For all substrates, neutral-detergent fibre digestibility (NDFD) and NH3-N concentration were not affected by the addition of enzymes. The treatment of forages with CEL increased the production of propionate for grass hay, corn stover and barley straw, and increased total VFA production for wheat straw and corn stover. No effects of MIX and XYL treatments on VFA production were observed for any substrate. The results indicate that the pre-treatment of low-quality forages with fibrolytic enzymes under the conditions of the present experiment contributed little, if any, to ruminal fibrolytic activity
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