TY - JOUR

T1 - Minimization of rate of inbreeding for populations with overlapping generations combining live and frozen genetics

AU - Sonesson, A.K.

AU - Meuwissen, T.H.E.

PY - 2001

Y1 - 2001

N2 - 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.

AB - 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.

M3 - Article

VL - 84

SP - 24

EP - 25

JO - Journal of Dairy Science

JF - Journal of Dairy Science

SN - 0022-0302

ER -