MONITORING OF MILK QUALITY OF COWS IN DIFFERENT CALVING SEASON

Abstract

The main task in dairy cattle breeding is to obtain a sufficient amount of quality milk, which meets requirements if population for milk and dairy products. The aim of the research was to substantiate possibility of increasing the cow milk productivity and improving milk quality through control of the microbiological and technological parameters of milk. According to the research results, it has been determined that the longest lactation of cows in spring and summer calving periods made 105 and 103 days, respectively, pf cows of group 4 - 98 days, which led to increase in their lactation period to 318-322 days. In the first three months of lactation, the largest part of milk yield was shown by the summer calving cows (34.5% of the total milk yield), in the period from 4 to 6 months - by the autumn calving cows (38.1%) and in the period from 7 to 10 months of lactation - by the autumn calving cows as well (33.6%). Cows of the fourth group had the highest butterfat content (4.38%), in the first it was lower by 0.2, in the second - by 0.16 and the third - by 0.1%. The highest protein content in milk was found in cows of summer calving - 3.37%, spring - lower by 0.07%, winter - by 0.05% and autumn - by 0.11%. The milk density was in the range of 1.027-1.028 g/cm³, acidity 16.70-17.93 °T, mass fraction of fat 4.18-4.38%, protein - 3.26-3.37%.