Evaluation of vaccination effect on cow milk quality

Producing high quality cow milk is a priority for agricultural enterprises. Mastitis has a major impact on milk quality due to the increased somatic cell count in milk and the bacterial contamination of milk with microorganisms. To solve this problem, an experiment was carried out to study the effect of vaccinating cows on the incidence of their mastitis and on the somatic cell

count in the milk. During the study period, it was found that the cows in the experimental group (vaccinated animals) had 6.1 times less mastitis than the control group (unvaccinated animals). In the experimental group, the number of sick animals varied slightly over the months of the study, ranging from 14.1% to 17.5%. In the control group, this indicator was 4.7, 7.0 and 6.8 times higher in the first, second to third and fourth to sixth months of the study, respectively. The number of cows with subclinical mastitis in the control group was 5.0, 5.7 and 5.6 times higher than in the experimental group during the same study periods. The cows in the experimental group also developed clinical mastitis less frequently – 4.1, 10.1 and 9.1 times, respectively. The highest average somatic cell count in the milk of the cows of the experimental group was recorded in the first month after calving – 240 thousand cells/cm3. In the following months this indicator was lower ranging from 200 thousand cells/cm3 to 210 thousand cells/cm3. Individually, the somatic cell count of cows in the experimental group did not exceed the norm (up to 400 thousand cells/cm3). In the control group, this indicator was higher, ranging from 520 thousand cells/cm3 to 600 thousand cells/cm3, and the somatic cell data varied greatly, with a peak in the fourth month of the study. Thus, vaccination helps to reduce the incidence of mastitis in the animals and the somatic cell count in the milk, which has a positive effect on its quality.

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