Influence of the season of the year and the lactation period on the dynamics of the content of somatic cells in the milk of Holstein cows
2021
Zinnatov, Farit F.
Milk and fermented milk products belong to the group of everyday products and are a life companion from birth to old age. The main criterion for the quality of milk is to eliminate the causes that have a detrimental ef-fect on health, as well as on human safety. A factor in the safety of cow’s milk is its saturation with somatic cells. In healthy dairy cows, the number of somatic cells in milk is up to 300 thousand cells/ml. If the livestock has been infected, the number of cells changes accordingly and the number of pathogenic bacteria in milk raw materials increases. Scientists have proved that in the presence of somatic cells in the milk of cows more than 900 thousand cells/ml with milk yield of 4 thousand kg, there is a loss of milk equal to 600 kg. And with a productivity of 6 thousand kg - the resulting economic damage to dairy farming will be equal to 900 kg. Accord-ingly, the goal was set to determine the qualitative and quantitative content of somatic cells in milk among the Holstein dairy cows. To achieve this goal, a group of 77 animals was selected. And it was found that the maxi-mum rate of somatic cells in milk samples was observed especially in the spring-winter period. In the current 2021, as a result of the experiments, it was shown that high-yielding first-calf heifers have a high presence of somatic cell units in the winter and spring seasons (641 thousand/cm3 and 681.96 thousand/cm3). Due to the in-crease in the number of somatic cells in milk, a deterioration in the parameters of raw materials is observed, which in turn leads to a decrease in the quality of dairy products and grade. The economic damage caused by animal diseases, culling and reduction in the amount of milk, incur a loss in the economy and in the food ranks of the state.
Показать больше [+] Меньше [-]Ключевые слова АГРОВОК
Библиографическая информация
Эту запись предоставил Mari State University