Feed is a risk factor for poisoning the farm environment thus also fresh milk with pathogenic microorganisms ofListeriagenus species.Listeria ivanovii,Listeria innocua, andListeria seeligeriwere isolated from 9.2%, butListeria monocytogenesfrom 20.0% of feed samples. Most often different fodders (9.3%) and silage (4.7%) were contaminated withListeria monocytogenes.Listeriagenus species were isolated more often from feed prepared and used in organic dairy farm than from that used in conventional dairy farm, correspondingly 44.4% and 18.3%. NoListeria monocytogeneswas found in bulk milk samples of organic dairy farm.

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Holstein-Friesian Black-and-White cows with analogous characteristics were selected and randomly allocated into 4 groups (control and trials), 5 animals each. In vitro digestibility tests of the legumes (peas and fodder beans) are high from 80.50 % to 84.20 %. The feed ration digestibility study results show, that on average higher dry matter digestibility was in the 2 nd group-69.42 %, in which the feed ration peas "Bruno" was included, and the 1 st trial group-69.29 %, in which the ration peas+beans was included. The highest protein digestibility is also presented by the 2 nd trial group of cows-65.97 % and the 1 st trial group of cows-65.82 %. The milk yield decreases for the experimental groups (1 st and 2 nd) were smaller-0.8 kg, 1.3 kg, respectively, compared with the initial stage of the experiment (p < 0.05). The changes in productivity are mainly associated with the cows' physiological processes during their lactation and pregnancy cycle.In contrast, group 4 (control) showed a significant decrease in the average daily energy corrected milk yield (4.9 kg), compared with the initial stage of the trial. Compared with the control group, none of the dietary interventions showed significant (p>0.05) deviations.