Associations of mtDNA haplotypes with productive traits in pigs
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The mitochondrial genome plays an important role in energy production and cells functions control. Therefore, it can affect the traits which are significant for selection of farm animals. The published data allow assuming that the mtDNA variability in pigs is one of the ways to assess and predict the breeding and productive qualities. The aim of our work was to determine the mtDNA haplotypes by the D-loop region sequencing and evaluate their associations with the selection features in pigs. Studies were carried out on landrace sows (n = 2626) bred in the Russian Federation. We estimated the Muscle Depth and the Percent Meat. As a result, three mtDNA haplogroups (C, D, and E) were identified. In the studied group of pigs, haplotype E was determined in 1378 sows (52.5%) and had the highest frequency. Haplotype D was detected in 1064 sows (40.6%). In general, haplotypes of European origin were more common in our population. Among the haplotypes of Asian origin (including A, B, and C), only haplotype C was identified in our group of pigs. It was determined in 182 sows (6.9%). Haplotypes A and B were not identified. Analysis of variance (ANOVA) has demonstrated the significance of differences in the haplotypes of the mtDNA regarding the studied traits of meat productivity in sows. These facts confirm the prospects of mtDNA studies as determinants of pig productivity. Our results have shown that some haplotypes of mtDNA are largely related to phenotypic traits.
KeywordsmtDNA D-loop Haplotypes Pigs Productive traits Muscle Depth Percent Meat
This study was funded by the Grant of the President of Russian Federation for supporting of young Russian scientists-candidates of sciences (contract No. MK-1443.2018.11).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
The authors declare that animal tissue samples were collected by trained personnel under strict veterinary rules. Sampling was performed in accordance with the ethical guidelines of the L.K. Ernst Federal Science Center for Animal Husbandry.
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