Published in Scientific Papers. Series D. Animal Science, Vol. LXIV, Issue 1
Written by Nicoleta DEFTA, Răzvan POPA, Tomița DRĂGOTOIU, Izabela OPREA, Paula POȘAN, Dana POPA

The state of genetic balance in one or more loci, no matter if it concerns the loci involved in genetic determinism of quality or quantity traits, describes an ideal state, being influenced by natural selection, non-random mating, gene flow and genetic drift. The Hardy-Weinberg equilibrium trial presents a significant importance because any deviation from it reveals the existence of some disturbing, restrictive factors. Thus, in this direction, there were researched four swine statistical livestock, taking into account the aggregate genotype derived from prealbumins, transferrins and serum amylases. The significant distribution of the individuals which present the genotypical combination Pa^BPa^B/Tf^BTf^B/AmBAmB -(Landrace - 39.5%; Large White - 23.7%; Synthetic Breed P 2000 - 22.7%; Synthetic 345 - 31.9%) was characteristic of the four researched samples. Out of the 27 possible combinations in the three loci, there weren’t identified individuals with the aggregate genotypes in any sample: Pa^APa^A/Tf^ATf^A/Am^AAm^A; Pa^APa^A/Tf^ATf^A/Am^AAmB; Pa^APa^A/Tf^ATf^B/Am^AAm^A; Pa^APa^A/Tf^BTf^B/Am^AAm^A; Pa^APa^B/Tf^ATf^A/Am^AAm^A; Pa^APa^B/Tf^ATf^B/ Am^AAm^A. In order to estimate the balance state, it was calculated the determinant of the gamete matrix. The result of the genetic state Hardy Weinberg trial, simultaneously for the three loci (g₁₁ g₃₃ g₁₇ g₃₉ = g₃₁ g₁₃ g₃₇ g₁₉), emphasized the fact that none of the livestock is in genetic balance, as it follows: Landrace (0.0000215 ≠ 0.0000067), Large White (0.000039 ≠ 0.000041), Synthetic Breed P 2000 (0.000055 ≠ 0.000025), Synthetic Breed 345 (0.000004 ≠ 0.000030). This shortage of balance was caused by an indirect selection, with a higher coefficient of some genotypic combinations in comparison with the others.

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