Changes in the In Vitro Ruminal Fermentation of Diets for Dairy Cows Based on Selected Sorghum Cultivars Compared to Maize, Rye and Grass Silage

An in vitro experiment was conducted to determine the impact of silage produced from selected varieties sorghum on microbial fermentation profile cows’ ruminal fluid. To main products, fluid samples were obtained Polish Holstein–Friesian cows. Serum bottles filled with 80 mL samples, and 1 g one following substrates added: corn (CS), grass (GS), rye (RS), (sweet) (SS1), (grain) (SS2) or (dual-purpose) (SS3). The serum flushed CO2 fermented for 8 24 h at 39 °C. After incubation, gas rumen then analysed methane volatile fatty acid (VFA) contents using chromatography. use (SS) resulted a decrease total concentration VFA compared other silages, especially GS. Moreover, contained lower molar proportion propionic butyric acids when SS used CS. higher than RS samples. differences chemical composition between did not influence profile. A production, but without effects methanogenesis, observed GS analysis demonstrates physiological processes rumen, as evidenced by products fermentation. advantage is that addition SS, irrespective plant variety, reduced production analyzed may be diets dairy cows substitute silages.