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Since 2021, the Sverdlovsk region has switched to the cultivation and use of dairy cattle of the Holstein breed, obtained as a result of long-term use of the global gene pool of Holstein bulls. Evaluation of the effectiveness of rearing repair heifers from different servicing bulls is relevant and has practical significance. As a result of the conducted research, it was found that repair heifers increased their live weight with age, which by the age of 18 months reached from 508.0 kg (daughter of Thunderlight bull) to 529.3 kg (daughter of Seiner bull). The daughters of the Seiner bull have a higher growth rate. The daughters of the Thunderlight bull had lower live weight indicators for growth periods. The patterns of change in the average daily body weight gains in heifers-daughters of the evaluated servicing bulls were the same and corresponded to the general patterns of animal growth and development. The cultivation of repair young animals on the farm is profitable at a profitability level of 16.5-21.6%. Thus, the servicing bull has an impact on the growth and development of repair heifers, daughters, who are used to renew the herd. They differ in their features, despite the general patterns of growth and have different growth rates.

Sverdlovsk region is one of the leading regions in milk production. The main livestock of dairy cattle is represented by the Holstein breed, obtained as a result of long-term use of the global gene pool of Holstein servicing bulls. The assessment of the productive qualities of dairy cattle of the Holstein breed, including consideration of linear origin, is relevant and has practical significance. As a result of the conducted research, it was found that the farm is dominated by the number of cows of the Vis Back Ideal line, which account for more than 65.8% of the total number of cows. There is an unreliable insignificant difference in favor of cows of the Reflection Sovering line between groups of animals of different genealogical lines for the first and third lactation. With age, there is a decrease in milk quality indicators, such as FMF and PMF in milk from cows of all genealogical lines, which confirms the natural negative relationship between milk yield and milk quality indicators. The absorption of dairy black-and–white cattle of the domestic breed by the gene pool of the world’s most abundantly dairy breed, the Holstein, led to an increase in milk yields and the milk yield coefficient of these cows is much higher than 1000 kg. Despite the fact that the difference in milk yield is unreliable and the variation of the trait within each group along the line is quite significant, this is indicated by indirect traits such as the coefficient of milk production, milk yield for full-age lactation, etc., origin affects the productive qualities of cows.

The authors of the article consider the problem of protection of water bodies from pollution by oily wastewater from the territory of enterprises of the agro-industrial complex engineering and technical systems. A resource-saving technology for this wastewater treatment using multicomponent sorbents has been developed.

The authors of the article consider the problem of the formation of huge volumes of liquid toxic activated sludge in the biochemical method of the residential area wastewater decontamination. At present, there are no effective technical solutions and technologies in terms of eliminating the negative impact of activated sludge on environmental components. The article examines the technologies that allow to involve activated sludges in reuse and use them as fertilizers in agriculture. A resource-saving biotechnology for activated sludge dewatering and decontamination from ecotoxicants has been developed. The results of the study confirm the effectiveness of the process of heavy metal extraction from activated sludge.

The purpose of these studies was to assess the influence of Russian Black Pied cows’ body types on their productive longevity. The studies were conducted on the basis of enterprises of the Sverdlovsk region specializing in breeding of Russian Black Pied cattle. Most heifers were of the complex class “Excellent” (36.0%), less of “Satisfactory” (6.0%). The second largest class was “Good with a plus” (28.0%). A complex class of animals affects their milk production. When selecting first-calf heifers, taking into account the body type, it seems possible to obtain animals of a conformation complex class not lower than “Good”; to obtain at least 5000-5500 kg of good quality milk with a mass fraction of fat of 3.85-3.88% and protein fraction of 3.06-3.08% from cows of 305 days of lactation, depending on the potential of the breeding herd; to increase the duration of production use up to 4.3-6.8 lactations; to increase the level of lifelong yield to 29637.0-38126.8 kg of milk.