The aim of work is to explore influence of first fruitful insemination, service period and dry period to dairy productivity of Simmental cows. The research is aimed at studying the milk production of Simmental cows with different levels of reproductive qualities. The result of the research, a relation was established between the age of the first fruitful insemination, the duration of the service period, the duration of the dry period and milk production performance. It has been established that the age of the first fruitful insemination at 18-24 months has the most beneficial effect on subsequent milk production. The service period of 90-120 days has a positive effect to an increase in milk yield per 305 days of lactation, the longer service period negatively affects to the mass fraction of fat. With an increase in the duration of the dry period, the mass fraction of fat increases, but milk yield decreases. The influence of reproductive qualities to the milk protein is negligible. It was revealed that the age of the first insemination at 18-24 months is the most profitable for production. According to the results of the research, it can be judged that reproductive qualities, in combination with other factors, affect the milk productivity of Simmental cows.

Background: Toxocariasis is a zoonotic parasitosis with worldwide distribution. Environmental contamination with Toxocara eggs is a main source of human infections. In Russia, particular in Vladivostok, knowledge regarding the current situation, including distribution and environmental contamination by Toxocara spp., is largely unknown. Objectives: The present study investigated environmental contamination with Toxocara spp. eggs, in soil samples collected from sandpits and public parks in Vladivostok, Russia during 23-month period. Methods: A total of 260 soil samples from sandpits and 155 samples from public parks were collected during July 2015 to December 2017. Soil samples were tested by sedimentation/flotation technique. Seroprevalence of Toxocara antibody in human was analyzed using Toxocara canis IgG ELISA assay. Results: Overall, the annual prevalence of Toxocara spp. in sandpits varied between 20% - 23% the annual prevalence of Toxocara spp. in public parks varied between 25% - 42% in different years. The average number of Toxocara spp. varied from 0 to 220 eggs per 1 kg over the 3-years study period. The highest prevalence was registered in summer period. The significant correlation appeared between Toxocara spp. contamination rates in sandboxes and parks and the Toxocara prevalence in humans in 2016 year. Conclusions: Current study demonstrates that it is necessary to promote preventive public health measures to avoid soil contamination.