Milk productivity research of first, second, third lactations of third generation cows obtained from the daughters of purebred heifers of the imported fleckvieh breed

Armenian National Agrarian University, Yerevan, Armenia

^* Corresponding author: naz3@mail.ru

Abstract

The results, obtained in 2023 regarding the milk productivity of first, second, third lactation cows of fleckvieh breed acquired through custom pairing, testify that they surpass the first class standards of blonde and Holstein breeds in three generations. Thus, the third-generation cows surpass the blonde breed first class standards by 3338 kg or 95.4% for milk quantity, by 0.27 % for the fat content in the milk, by 0.09% for the albumen content in the milk, by 144.9 kg or 108.9 % for milk fat quantity, and surpass the Holstein breed by 1838, 36.8, 0.47, 0.19, 97.9, 54.4 accordingly. When choosing the parental methods for breeding third generation cows of the researched fleckvieh breed, the main selective property of pair selection is the milk fat + lactalbumin quantity, and the mothers have been inseminated with the semen of the bulls with 700 kg genetic capacity of the indicated property. The comparison of third generation mother-daughter milk productivity indicators shows that the milk quantity of daughters surpasses that of the mothers by 795 kg or 13.2 %. The milk quantity of daughters has formed 94% of genetic capacity, and in all the three generations the quantity of fat and albumen in mothers’ milk has been maintained, which in its turn is a great example of homogeneous pairing of inherited quantitative and qualitative indicators of the milk. It is hereby proposed to continue the pure breeding of fleckvieh breed animals and consider the indicator of genetic capacity of milk fat + lactalbumin quantity as the main property for the choice of parental methods of pair selection.