Minimization of rate of inbreeding for populations with overlapping generations combining live and frozen genetics

A.K. Sonesson, T.H.E. Meuwissen

    Research output: Contribution to journalArticleAcademicpeer-review

    Abstract

    Minimization of rate of inbreeding for populations with overlapping generations combining live and frozen genetics each selection candidate. The carrying capacity of the population is limited to a fixed number of animals per year. For survival rates <100 % the algorithm has to optimize the use of few old and less related animals with many young and higher related animals. For a scheme where the oldest animals were selected, ∆F increased with 18-5 2% compared with the proposed method. When freezing semen of all sires in a gene bank and assuming that each sire can be used infinitely, the relationships are set in the first 2-3 years, and thereafter the average co-ancestry of the population stays about the same, such that ∆F is approximately zero. Thus, the relationships among the live animals converges to that of the cryo conserved sires. The level of inbreeding in the optimal schemes with 6 new-born animals per year (3 sires + 3 dams) is 0.060, which is lower than the expected level of inbreeding when simply the 3 founder sires were cryo conserved, i.e. this would result in an inbreeding coefficient of 0.083 (=1/(4*3). The latter implies that the optimal method also conserves genes of the founder dams by using frozen semen of their male offspring.
    Original languageEnglish
    Pages (from-to)24-25
    JournalJournal of Dairy Science
    Volume84
    Publication statusPublished - 2001

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