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Influence of different factors for qualitative parameters of ensilage feedstuffs
 KUBÁT, Václav
In the operating conditions, for the period of three years, were estimated the qualitative factors affecting the qualitative parameters of grass silages. The fermentation characteristics and the total quality of silages were evaluated by the recommendations of AgroKonzulta Žamberk and EKO-LAB Žamberk companies. The feed samples (silages) were evaluated in two sets of databases. First set of samples assessed the impact of additive substances on the basis of parameters of fermentation characteristics. This first set of samples was divided into three groups; each of them had 14 samples. First group of the samples was untreated; no preservations were used on these samples. Into the second group of the samples were included the silages treated with bacterial preparations. The third group contained the silage samples treated with bacterial-enzyme preparations. It is possible to conclude that the silage{\crq}s additives positively affect the fermentation process and thus the final silage quality. High statistical significance (P < 0.01) was found for level of proteolysis. Better values were achieved in groups with the use of preservations. Group of grass silages using preservations achieved significantly better values (P < 0.05) in lactic acid content than the group with none using of the preservations. Grass silage samples treated with the bacterial-enzymatic preparations had about 14.4 % more representations in I. class quality than the group treated with bacterial preparation. The second set of samples was classified by the phenophases: before the heading, the beginning of heading and full heading. Each group contained 12 samples. The parameters of nutritional value were evaluated. The chemical compositions (NL, PDIN and SOH) were highly significantly affected (P < 0.01) by the phenophases. The best results have been reported in grass silage harvested in the phenophase before the heading. The chemical compositions CF and NEL were better (P < 0.01) in grass silages harvested in the phenophase before the heading and in the phenophase the beginning of heading against grass silage harvested in the phenophase full heading.
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