Physicochemical properties of milk by red-motley breed cows

Abstract

Milk is one of the most necessary products for the human organism, as it is the main source of native proteins, essential amino acids and vitamins. Due to this, special attention is paid to the evaluation of milk quality indices. The research was conducted in JSC “Berezovskoe” of the Kuraginsky district, Krasnoyarsk Region in November 2017. During the experiment cows-daughters of four stud bulls of the Red-Motley breed were divided into four groups according to the data of the primary pedigree records. The daughters of Day 18486 bull were in group I, daughters of Dinar 28524 - in group II, daughters of Disk 4313 - in group III, daughters of Doping 28618 - in group IV. Each group had 12 heads. Indicators of milk productivity and development of cows-daughters were established according to the data of primary breeding records of the farm using the Selex program. As the result of the milk productivity analysis for the first lactation, a slight superiority of Disk cows-daughters (group III) over daughters from other groups in milk yield and protein mass fraction was established, and significant superiority in comparison with animals of group IV - in the fat mass fraction (+0.16 %; P>0.95). Most of physicochemical indicators of cows were within the norm, except for the number of somatic cells, which in the milk of Dinar cows-daughters (group I) was within the norm (138.67 thousand/cm³), but in the milk of other groups cows (417.67-552.33 thousand/cm³) - higher by 17.67-152.33 thousand/cm³ (4.4-38.1%).