The influence of the silage with high acidity on the rumen fermentation of cows
2004
Dolezal, P. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic). Ustav Vyzivy a Krmeni Hospodarskych Zvirat)
The aim of the study was to determine the influence of maize silages with different concentrations of acids on rumen fermentation in dairy cows. Ten experimental cows were fed inoculated maize silage with 106.53 g/kg DM of lactic acid and very low pH (3.7). Rumen fluid was taken out per os 2-3 hours after feeding and compared with that of 10 control cows. The intake of total acids per 1 kg live weight was higher in experimental than in control cows (1.98 vs. 1.48 g/kg). The mean value of rumen pH was significantly lower in the experimental (5.8+/-0.08) than in the control group (6.2+/-0.06). An increase (P0.01) of VFA concentration (125+/-5.2 mmol/L) and lactic acid concentration (4.8+/-0.2 mmol/L) in rumen fluid was observed in experimental cows. Significant differences in propionic and butyric acids concentrations were also found out. The concentration of Infusoria was lower (P0.01) in experimental than in control cows (176 vs. 288 thousand/mL). The occurrence of acidosis in cows from the treated group was confirmed. Our results documented the negative effect of acid silages on rumen fermentation.
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