SUMMARY
Submitted 2020-07-02 | Accepted 2020-08-28 | Available 2020-12-01https://doi.org/10.15414/afz.2020.23.mi-fpap.162-166ß-carotene has many important functions in the body: as a precursor of vitamin A, it works as antioxidant and affects the fertility of cows. This paper presents the results of measurements of the content of ß-carotene in the blood serum of cows from different farms in Slovenia. Blood samples of cows (n = 604) from 176 farms with impaired fertility were analysed for ß-carotene content using Yudkin's photometric method. The descriptive statistics and the proportion of samples that deviated from the reference values were calculated. Influence of month of sampling and farm on ß-carotene level was studied as well. The median value of ß-carotene in the investigated samples was 5.02 mg/L (minimum 0.63 mg/L, maximum 16.10 mg/L) and was within the reference range. In 32.8% of cow samples, the content of ß-carotene was below the reference value (4.0 mg/L). 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