The article describes the results of a study of the parasitofauna of small ruminants in the Vologda Region. Parasitizing of 13 species of helminths belonging to 2 classes Cestoda and Nematoda has been established in sheep. Infection of sheep with helminths of Strongylata makes 16.6 to 100%. The species composition of goat helminths in the private subsidiary farms of the Vologda Region is represented by 9 types of helminths belonging to the Nematoda class.

In the conditions of the analyzed farms, studies were conducted on growing black-motley heifers of different lines. As the results of the conducted studies have shown, the live weight of heifers in all age periods of the studied lines at the analyzed enterprises is at the level of class I standard requirements or exceeds them by 6-11%. The average daily weight gains of heifers of the studied lines at the age from birth to 6 months were 690-820 g, at the age of 6-10 months – 570-810 g, at the age of 10- 12 months – 600-750 g, at the age of 12-18 months – 620-680 g.

The present research has shown the growth and development of Nile tilapia (Oreochromis niloticus L.) fry effected from feeding Enzimsporin probiotic supplement. During the observation period, the weight of tilapia fry population has increased from 119.5g to 619g in the control group, from 121g to 684g in the 1st experimental group 1 and from 119g to 790g in the 2nd experimental group. Thus, the average daily weight gain per fish is 0.44g, 0.51g and 0.6g, respectively in 22 days.

On crops of white mustard on sod-slightly podzolic soil with a humus content of 2.6%, pests were registered: pests of beetles, bugs, and aphids. High efficiency of Sumi-alpha, EC was revealed with a consumption rate of 0.2 l/ha on the 20th day after treatment, the effectiveness against flea beetles, rape flower beetles, bugs and aphids was 92.6%, 93.4%, 97.5% and 98.5%, respectively.