Characteristics of economically useful traits of mixed sows TN70 of different lines depending on age

The article presents data on the comparative characteristics of economically useful traits of crossbred sows TN70 (the result of crossing Topigs large white and Norsvin landrace) of different lines. Research experiments were carried out at Kamsky Bacon LLC in the Tukaevsky district of the Republic of Tatarstan from November 2022 to January 2024 to study the TLLAA and TLLZA lines. In terms of reproductive qualities, the TLLZA line of the TN70 cross was superior to the TLLAA line in all compared age groups. The multiparity of the TLLAA line gradually increased from the first farrowing from 14.56 to 14.96 heads to the second and to 16.45 heads to 3 or more farrows. The survival rates of this line decreased from 13.82 to 12.95 heads from the first to the third or more farrowings. The multiple pregnancy rates of the TLLZA line increased from the first farrowing from 14.67 to 19.33 heads to the second, and then decreased to 17.5 heads by the third or more farrowings. The safety of piglets at weaning decreased from 13.83 to 13 heads from the first to subsequent piglets.