Relevance. The most important task of animal husbandry is to provide the population with high-quality food products, and industry with raw materials. Pig breeding plays a significant role in its solution [10–12]. The subprogram «Development of Sub-Sectors of Animal Husbandry, Processing and Sale of Animal Products» until 2025 provides for the comprehensive development and increase in the efficiency of production of animal products and products of its processing. To achieve this goal, it is necessary to solve the problems of increasing the production of livestock products, aimed at accelerated import substitution, and the development of processing of livestock products. The production of pigs for slaughter in live weight in Russia by 2025 needs to be increased to 6 million tons, which is almost 2 million tons more than in 2019 [3].

The profitability and competitiveness of pork production are largely determined by the efficiency of using broodstock, which is the basis for the formation of productivity of fattening young animals and therefore has a significant impact on their production and economic indicators [8, 9].

One of the most important economically useful traits in pig breeding is considered to be the reproductive qualities of pigs, which are characterized by multiple fertility (number of piglets at birth), milk production (weight of the nest of piglets at 21 days of age), the weight of piglets and the total weight of the nest at weaning [2]. This group of traits refl ects the ability of sows to bring a certain number of piglets per farrowing, to raise them with the least mortality and a large weight for weaning. The general production of pork and the economy of pig breeding as a whole strongly depend on reproductive capacity [5, 6].

Domestic pig farms widely use breeding pigs imported from abroad, and in particular from Canada. However, to date, the level of use of the genetic potential of various breeds and breed combinations of Canadian breeding pigs remains low [13, 14].