Inbreeding and reproductive signs in mini-pigs ICG SB RAS

Abstract

There is practically no statistical analysis of the influence of the degree of inbreeding on the reproductive qualities of laboratory mini-pigs in the literature. The present work is aimed at determining the impact of the inbreeding factor on the development of such signs of reproduction as live weight at birth, multiple births and the safety of piglets during the suckling period. Laboratory mini-pigs bred at the Institute of Cytology, and Genetics SB RAS (Novosibirsk, Russia) were selected as the research object. The following signs were directly evaluated: the mass of an individual at birth (significant fertility); intra-nest minimum and maximum by live weight at birth; the intra-nest standard deviation of live weight at birth; the number of live piglets in the nest at birth (multiple births); safety from birth to 30 days; safety from the 6th to the 30th day of life. The results showed that the relationship between Shapiro and the inbreeding coefficient by Wright did not significantly affect the studied traits. The use of a linear regression model in the analysis indicates the existence of an inverse dependence of the intra-nest standard deviation of the live weight of a newborn piglet on the Wright inbreeding coefficient. An assumption was made explaining the almost complete absence of the influence of the inbreeding coefficient on the development of the average values of reproductive traits. This was because of the breeding system, in which close inbreeding was used with “looping” on the best animals. The primary vector of selection is aimed at the viability and development of a harmonious exterior of animals. Thus, systematic closely related crosses with the primary vector contributed to the purification of the herd from harmful recessive mutations, which are considered the leading cause of the negative consequences of inbreeding