The aim of the work is to study the dynamics of live mass, breeding and genetic parameters of Holstein heifers of Ger-man breeding of different generations in breeding farm of ZAO “Glinka”,of the city of Kurgan, to use the results of the research in improving Holstein (black and motley) breed. Ac-cording to the goal the following tasks were solved: studying the dynamics of the live mass of repair heifers of Holstein breed of German breeding of various generations; establish-ing the coefficients of variability, the frequency of the live mass of repair heifers of Holstein breed of German breeding of various generations. Three groups of heifers were formed: group 1 - first generation of 1 (n = 91), group 2 - second generation (n = 42), group 3 - third generations (n = 20). The weight increase was determined from the change in the live weight from birth to 18 months of age. The absolute, average daily and relative increments of live weight were calculated. The coefficient of recurrence was determined by correlation method. The live weight of repair heifers of Holstein breed of German breeding 1, 2, and 3 generations had different level from birth to 18 months of age. The growth rate was observed in the periods: 6-12 and 12-18 months. Thus, average daily gain of repair heifers in the period of 6-12 months reached 852 g in the first generation, while in the second and third it reached 124 g (14.5 %) and 116 g (13.6 %), respectively. The level of repeatability coefficients between the live mass of repair heifers of different generations did not insure confi-dence in breeding due to low correlation values between live weight from birth to 18 months of age, and at 6.10.12 months the coefficient was positive and with the third confidence level (P <0.001) in all three groups, which allows the breeder to conduct effective breeding at desired live weight during these periods, starting at the age of 6 months.
Holstein breed of German breeding, genera-tion, live weight, absolute, relative, average daily gain, re-peatability
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