The effect of mating design on genetic gain and inbreeding

Using appropriate mating designs are important in animal breeding for higher genetic gain in next generations. Thus, the aim of this study was to evaluate genetic gain, increase of average inbreeding and accuracy of prediction using simulated data and di↵erent mating designs. QMSim software was used for simulation and creation of population. Two level of heritability (۰.۰۵ and ۰.۴۵) and five different maing designs including random mating (rnd), mating based on minimum inbreeding (mini), mating based on maximum inbreeding (maxi), positive assortative mating design based on phenotype (phen) and positive assortative mating design based on estimated breeding value (ebv) were assigned. The genetic gain after twenty generation simulation in rnd, mini, maxi, phen and ebv mating designs with heritability ۰.۰۵ were ۰.۷۵۶, ۰.۸۳۶, ۰.۹۰۷, ۰.۷۹۲ and ۱.۰۶۱ respectively. On the other hand, for heritability ۰.۴۵, genetic gain after twenty generation simulation in rnd, mini, maxi, phen and ebv mating designs were ۳.۱۷۲, ۲.۶۸۸, ۳.۰۲۹, ۳.۴۶۲ and ۳.۷۹۱ respectively. Results showed that after twenty generation simulation, increase of average inbreeding for heritability ۰.۰۵ was ۰.۰۷۹ in rnd, ۰.۰۲۶ in mini, ۰.۳۱۶ in maxi, ۰.۰۷۳ in phen and ۰.۲۲۳ in ebv, respectively. In contrast, for heritability ۰.۴۵ after twenty generation simulation, increase of average inbreeding was ۰.۰۶۹ in rnd, ۰.۰۳۷ in mini, ۰.۳۷۳ in maxi, ۰.۰۸۵ in phen and ۰.۱۶۳ in ebv, respectively. In conclusion, the genetic gain in mini design was greater than other mating designs per ۱% increase of inbreeding, and had higher performance compared with the other mating designs

کلیدواژه ها:

accuracy ، heritability ، inbreeding ، mating