Acta Univ. Agric. Silvic. Mendelianae Brun. 2004, 52, 91-96
Published online 2015-07-18

The influence of the silage with high acidity on the rumen fermentation of cows

Petr Doležal

Ústav výživy a krmení hospodářských zvířat, Mendelova zemědělská a lesnická univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republika

Twenty dairy cows were used in an experiment at which the influence of silages with different content of acids on the rumen fermentation was studied. Animals were divided into experimental and control group, each of them about 10 individuals. Feeding ratio consisted of maize silage (26 kg), alfalfa silage (13 kg), meadow hay (1 kg) and corn mixture (8.5 kg). The experimental group was fed an inoculated maize silage, with higher contents of fermentation acids. Intake of total acids per 1 kg live weigh was higher in the experimental group than control group (1.98 g/kg; 1.48 g/kg live weight, respectively). The rumen fluid was taken per orally 2-3 hours after feeding. Mean value of pH of rumen fluid was significantly (P<0.05) lower in the experimental group (5.8 ± 0.08) in comparison with control group (6.2 ± 0.06).
The most significant increase (P<0.01) of VFA content (125 ± 5.2 mmol/l) and lactic acid content (4.8 ± 0.2 mmol/l) was observed in rumen fluid of experimental group. Significant differences (P<0.05) of propionic acid and butyric acid content were also found out between the groups. Nevertheless, acetic acid content was insignificant (P>0.05) lower in experimental group. A protozoa (infusoria) content was significantly (P<0.01) lower in the experimental group (175.76 ± 12.54 thousand/ml) as compared with the control group (288.1 ± 13.73 thousand/ml).


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