Large white pigs of different genealogical groups' economically useful features

The aim of research is to study economically useful traits of pigs of different genealogical groups of the large white breed. Objectives: to study the reproductive productivity of the main lines and families of large white pigs with intraline breeding. Research was carried out in a pedigree reproducer for breeding large white pigs in the Tyumen Region. The object of research was the broodstock and boars of a large white breed of two factory lines and four families. Indicators of productive qualities of pigs are taken from the database of the program "1C: Enterprise 8. Breeding in animal husbandry. Pig breeding ". Research results were processed biometrically using the MSOffice software application. It was found that the indicators of milk production, nest weight at birth and at weaning in sows of the Bely Oryol line are higher in comparison with queens of the Maxi line. Sows of the Soya family are characterized by a higher nest weight during farrowing than that of the uterus of the families Reklama, Znamenka and Beatrice, by 10.3 %, by 7.7 and 7.1 %, respectively. The multiple fertility rates of the Znamenka family when mated with Maxi line boars are 7.5 %, 11.6 and 6.2 % higher than those of the Reklama, Soya and Beatrice families, respectively. The milk production of sows of the Soya family when mating with boars of the Bely Oryol line exceeds this indicator in the Znamenka family by 8.7 %, Beatrice by 14.5 and Reklama by 22.4 % (P≥0.95). The prolificacy and milk production of Soya sows when crossed with boars of the Bely Oryol line is 8.8 and 11.0 % more than when combined with boars of the Maxi line. Based on the studies conducted, it can be stated that the best reproductive qualities are characteristic of intra-breed combinations when breeding sows of the Soya and Znamenka families with boars of the Bely Oryol line