ХАРАКТЕРИСТИКА КОРРЕЛЯЦИОННЫХ СВЯЗЕЙ МЕЖДУ КОМПОНЕНТАМИ МОЛОКА КОЗ МОЛОЧНОГО И КОМБИНИРОВАННОГО НАПРАВЛЕНИЙ ПРОДУКТИВНОСТИ

Abstract

Dairy goat breeding is developing dynamically in the world and in Russia. To scientifically substantiate the breeding strategy of dairy goats, meat-dairy goats and dairy-meat ones, it is necessary to expand information about the composition of goat milk and the nature of correlations between its components. In the article, the composition of goat milk of dairy goats, meat-dairy goats and dairy-meat ones is considered in the comparative aspect. The correlation coefficients between the indicators studied by infrared spectroscopy and flow cytometry using automatic CombiFoss 7 DC analyzer are presented. It was found that milk of dairy-meat and meat-dairy goats significantly exceeded milk of dairy goats in terms of the mass fraction of fat, protein, levels of saturated and unsaturated fatty acids, lactose and urea. At the same time, the level of differential cells was significantly lower. The nature of the relationship between mass fraction of fat and other components of milk in goats with different severity of milk productivity was the same both in strength and in orientation. A high positive relationship (r = 0.65…0.99) was revealed between the mass fraction of fat and the content of fatty acids, both saturated (SFA, LCFA, MCFA) and unsaturated (MUFA, PUFA, SCFA). Differences in the nature of the relationship between the content of casein and lactose, casein and DSCC were established. For milk of dairy-meat and meat-dairy goats, it was low negative (r = –0.27 and –0.31), for milk of dairy goats – low positive (r = 0.29 and 0.28). Differences were also found between mass fraction of true protein and fatty acids, MDB and the level of somatic cells. Mass fraction of true protein in milk of dairy goats was weakly negatively correlated with LCFA, SCFA, KSK and DSCC (r = –0.16…–0.32), in milk of dairy-meat and meat-dairy goats this relationship was weakly positive (r = 0.14…0.26).