Association of leptin (LEP) gene polymorphism with reproduction traits of domestic and imported Holstein cattle in different milking technologies and housing conditions

Abstract

The article presents results of traits of reproductive ability of Holstein cows of domestic (379 animals) and imported (228 animals) breeding with different genotypes of the leptin gene (LEP) with different milking technologies and housing conditions. Frequency of occurrence of genotypes of LEP gene in imported herd range: CC – 32.5; TC – 49.1 и TT – 18.4 %. In herd of domestic animals frequency of CC, TC and TT genotypes of LEP gene was – 23.5; 54.3 and 22.2 %. In our research it has been shown that animals with the TT genotype of the LEP gene are distinguished by the best traits of live weight at the first fruitful insemination, reproductive capacity coefficient, Dohi index, yield of calves per 100 cows, duration of the calving interval and open days, compared with animals with CC and TC genotypes. Among the cows of domestic breeding, superiority was established for animals with the TC genotype in traits of live weight, service period and Dohi index. For others traits of reproductive ability stand out favorably animals with the CC genotype of the LEP gene. In the context of two farms in the course of the experiment, it is noted that Holstein cows of imported selection with yard housing technology have the best indicators of reproductive qualities, compared with the population of domestic selection of stall barn housing technology. It follows from this that genetic and paratypic factors, along with such herd management principles as milking technology and housing conditions, equally affect the reproductive qualities of Holstein cattle. This research was supported by FASO Russia project number 122011800138-7.