Original scientific paper
Effect of the maturity stage of grass at harvesting on the chemical composition of grass clover silage
Mladen Knežević
; Faculty of Agriculture, University of Zagreb, Zagreb, Croatia
Marina Vranić
Goran Perčulija
Ivana Matić
Marija Teskera
Abstract
The objective of this research was to determine changes in chemical composition and fermentation quality among grass clover silages harvested at different maturity stages. Grass clover silage was harvested in three maturity stages of orchardgrass (Dactylis glomerata L.) that was a dominant grass in the sward: late vegetative (GS1), internode elongation (GS2) i and flowering (GS3). Classical chemical analysis methods were used to analyse 16 samples of each of the maturity stage. Dry matter (DM) content of GS1, GS2 and GS3 was 396, 408 and 463 g kg-1 of the fresh sample, respectively, while crude protein (CP) content was 120, 98 and 90 g kg-1 DM respectively. While comparing GS3 and GS1, delaying the term of grass harvesting significantly increased DM content (P<0.001), organic matter, (P<0.001), neutral detergent fibre (NDF) (P<0.05) and acid detergent fibre (ADF) (P<0.001). Early cut silage had significantly higher content of CP (P<0.001) in comparison with medium and late cut grass silage. It was concluded that maturity stage of grass clover at harvesting has significant influence on silage chemical composition. If the aim of production is higher quality grass silage, grass has to be cut at the earlier maturity stage.
Keywords
silage; maturity stage; chemical composition, fermentation quality
Hrčak ID:
32959
URI
Publication date:
3.3.2009.
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