Intra sire regression of offspring on dam

INTRA SIRE REGRESSION OF OFFSPRING ON DAM

  • In farm animals a male is mated to several females and therefore the regression of offspring on mid parent is inappropriate.
  • Since there are usually a few male parents and the mating is not random the simple regression on one or other parents are both unsuitable.
  • The h2 can however be satisfactorily estimated from the average regression of offspring on dams calculated within sire groups. That is to say, the regression of offspring on dam is calculated separately for each set of dams mated to one sire and the regression in each set is pooled in a weighted average.
  • The ISD estimates half the h2 asIntra sire regression of offspring on dam
  • This method eliminates the environmental cov that arises if sire groups have been in different environment / herds. This method also helps to overcome the differences among herds / breeds / sires.
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Last modified: Tuesday, 26 July 2011, 9:20 AM