Influence of Maximum Inbreeding Avoidance under BLUP EBV Selection on Pinzgau Population Diversity

Abstract

Evaluated was effect of mating (random vs. maximum avoidance of inbreeding) under BLUP EBV selection strategy.  Existing population structure was under Monte Carlo stochastic simulation analyzed from the point to minimize increase of inbreeding. Maximum avoidance of inbreeding under BLUP selection resulted into comparable increase of inbreeding then random mating in average of 10 generation development. After 10 generations of simulation of mating strategy was observed ΔF= 6,51 % (2 sires), 5,20 % (3 sires), 3,22 % (4 sires) resp. 2,94 % (5 sires). With increased number of sires selected, decrease of inbreeding was observed. With use of 4, resp. 5 sires increase of inbreeding was comparable to random mating with phenotypic selection. For saving of genetic diversity and prevention of population loss is important to minimize increase of inbreeding in small populations. Classical approach was based on balancing ratio of sires and dams in mating program. Contrariwise in the most of commercial populations small number of sires was used with high mating ratio