The influence of the age of the first insemination of repair pigs on their productivity
The purpose of the study conducted in 2018-2020 is to study the dynamics of changes in the age of the first insemination of Large White gilts. Two indexes have been developed for breeding selection of replacement young animals. The first index allows you to evaluate replacement pigs when they reach a live weight of 100 kg, focused on the length and yield of lean meat. The second index allows selection of gilts at the first insemination, includes the age of the first insemination and indicators of growth and development. Selection selection of replacement young animals for three years according to indices allowed to reduce the age of reaching a live weight of 100 kg by 1 day, increase the body length by 3 cm, muscle depth by 0.2 mm, the index value by 32.7 points. The results of the analysis did not reveal significant differences in the groups in terms of growth and development of gilts. It is noted that replacement pigs, inseminated at the age of 6.5 - 7 months have a maximum duration of use of 3 farrowings with low reproductive ability.