Wydanie 338(44)4 2017

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    The quality and aerobic stability of silages from a mixture of legumes with grasses with a chemical and microbiological additives
    (Wydawnictwo Uczelniane Zachodniopomorskiego Uniwersytetu Technologicznego w Szczecinie, 2017) Dorszewski, Piotr; Grabowicz, Małgorzata; Department of Animal Science, UTP University of Science and Technology, Bydgoszcz; Department of Animal Science, UTP University of Science and Technology, Bydgoszcz
    The best way of preserving wet roughage is ensiling. However, fermentation which is performed improperly can lead to obtaining poor quality silage. The aim of the study was to determine the effect of a chemical preservative and a microbial additive containing lactic acid bacteria, including Lactobacillus buchneri, on the chemical composition, quality and aerobic stability of silages. The experimental material was wilted (302.8 g dry matter ・ kg‒1) green forage from the second swath of a mixture of legumes with grasses in the first year of use which was ensiled in cylindrical experimental polyvinyl chloride (PVC) minisilos with a capacity of 8654 cm3. Three types of silage (in 4 minisilos each) were made: control without additive, with a chemical additive and with an inoculant. The chemical preservative consisted of a mixture of acids: 22.5‒27.5% lactic acid; 26.2‒33.7% phosphoric acid; 3.8‒5.1% formic acid; 3.8‒5.1% propionic acid ‒ dosage 6 l ・ t‒1 of green forage. The Enterococcus faecium, Lactobacillus plantarum, Lcb. casei, Lcb. buchneri, Pediococcus pentosaceus bacteria contained a microbiological additive in the amount of 15 ・ 109 cfu ・ g‒1 of the preparation - dosage 150 g ・ t‒1 of green forage. The ensilability of green forage was evaluated, a chemical composition analysis of silage was performed and their qualitative parameters were determined ‒ pH, N-NH3 to Ntotal, content of lactic acid, acetic acid and butyric acids was determined. The stability of silage under aerobic conditions was also evaluated. The ensilability of the green forage was middle. The silage with a chemical additive contained more dry matter, lactic acid and acetic acid, and less acid detergent fibre (ADF) than the control silage. The silage with the inoculant contained more dry matter, nitrogen-free extracts (NfE), lactic acid and acetic acid, and less crude fat and crude fibre, butyric acid and ADF compared to the silage without additives. The additives did not improve the aerobic stability of silage from the legume-grass mixture.