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Cytochrome b haplotypes (GenBank OCU07566, NCBI, USA) of mitochondrial DNA (mtDNA) were described in meat lines of rabbits – cyt b 430 and cyt b 306. The haplotype cyt b 430 represents 571A (190Threonine-T)+877G(292Alanine -A). Haplotype cyt b 306 with polymorphism A571G mtDNA-cell line LEU-RAB is registered as BioSample: SAMN03701526; Sample name: cyt b O.C. (Model organism or animal sample from Oryctolagus cuniculus), in NCBI, USA. The vitality of offspring of the cyt b 306 haplotype, represented by the average number of weaned youngs at 42 days of age, was significantly higher compared to the haplotype cyt b 430 ( ẍ = 7.00 vs. ẍ = 5.69, t (0.01) = 2.91++). These results are confirmed also by the immunogenetic results determined using flow cytometry. Haplotype cyt b 306 is characterized by a significant increase (P = 0,041+ to P = 0,049+) of the flow cytometric parameters at the frequency of T lymphocytes, which results in activation of lymphocytes of the type pT2 and CDS4 (pT2 = 22.02 ± 4.45 % and CD4 = 17.08 ± 3.43 %), compared to the cyt b 430 haplotype, which is represented by significantly lower values of the flow cytometric parameters in activation of lymphocytes of the pT2 and CD4 type (pT2 = 15.32 ± 6.11 % and CD4 = 11.8 ± 4.83 %). Meanwhile, in the reproduction parameters such as the average number of live-born kits, no differences (8.45 vs. 8.00) were determined between the studied haplotypes (cyt b 306 vs. cyt b 430). Similarly, production parameters represented by carcass value (carcass without the head and skin) of both haplotypes (cyt b 306 vs. cyt b 430) were not influenced by the targeted selection and remained on the same level of 54 % (54.41 vs. 54.26).
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