Determination of milk physical and chemical indicators on a Bentley analyzer

The purpose of the study is a comparative assessment of the physical and chemical parameters of milk. Comprehensive studies to assess the quality of milk were carried out by taking 100 milk samples of 20 ml in each of three farms in the Krasnoyarsk Region. Control group - Solgon JSC, 1st experimental group - Taezhny Plemzavod LLC, 2nd experimental group - Nazarovskoye CJSC. Samples were taken during morning and evening milking in accordance with the standard requirements for control milking of cows on farms. The analysis was carried out in 2022 during the winter-stall period. In average daily milk samples, the mass fractions of fat (MFA), protein (MPB), urea content, and beta-hydroxybutyrate (BHB) were determined. The milk of the experimental groups exceeded the milk of the control group in the content of the mass fraction of fat by 0.12 and 0.46 %, lactose - 0.03 and 0.92 %, and SOMO - by 0.07 and 2.89 %, respectively. The mass fraction of protein in the milk of the studied groups was in the range of 2.44-3.8 %. In the experimental groups, an increased content of somatic cells in milk was observed by1.03 and 42.62 %, respectively, compared to the control group, which is a sign of intense metabolism and mobilization of body fat reserves. The highest urea content in milk was recorded in the second experimental group (81.15 % more), and the level of BHB in milk was 30.81% less compared to the control group. The highest BHB value - 10.51 mmol/l was noted in the first experimental group, which is 12.05 and 61.9 % more compared to the control and second experimental groups. Regular testing of milk quality indicators on a high-precision Bentley brand milk analyzer will allow specialists to carry out timely diet adjustments, preventive measures, and monitor the physiological state of animals in order to correct culling.