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Vliv silážních inokulantů na bachorovou degradovatelnost škrobu silážovaného kukuřičného zrna
Valentová, Miroslava
Ruminal degradability of starch is an important indicator of utilization of starch by rumen microflora. Indicates the ratio between starch, which is fermented in the rumen, and starch, that escapes ruminal digestion. Determination of rumen degradability of starch is important not only in terms of performance and health of dairy cows, but also in terms of economy of farming. Corn starch, compared to other starch rom cereals, has lower rumen degradability, which is a prerequisite for efficient use of animals. The aim of this thesis was to evaluate the effect of silage inoculants on the quality of the fermentation process, the chemical composition of silage and level of rumen degradability of starch in model silage from mechanically treated corn grain. Ruminal starch degradability was determined by in sacco method. Treatment of matter by silage additives had statistically significant effect neither on the chemical composition, nor on ruminal degradability of starch. In the evaluation of the fermentation process was at application of silage inoculant found statistically significant effect (P <0,05) on dry matter content , pH , content of ammonia , acetic acid , the ratio of lactic acid and acetic acid and ethanol. For silage treated with inoculant was statistically significant higher solids content ( 695,36 +- 2,342 g/kg) and a statistically significant lower pH ( 3,99 +- 0,002) compared to control. Neither in acidity of water extract nor in the content of preserving lactic acid, was found statistically significant difference. For the inoculated silage was found statistically significantly lower content of acetic acid (4,10 +- 0,157 g/kg DM). The content of propionic acid and undesirable butyric acid was for any silage found. In overall content of fermentation acids was no statistically significant difference. The ammonia content, which represents the decomposition of nitrogenous substances, was in the inoculated silage statistically significantly lower (0,53 +- 0,031 g/kg DM) than in untreated silages and so was statistically significantly lower the content of ethanol (0,94 +- 0,145 g/kg DM). The use of silage inoculant had no statistically significant effect on the acidity of the water extract, lactic acid content and the amount of acids.
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