Impact of incorrect weighing of traits in the aggregate genotype of pigs on genetic gain
2001
Wolfova, M. | Wolf, J. (Vyzkumny Ustav Zivocisne Vyroby, Prague-Uhrineves (Czech Republic) | Nitter, G.
Genetic gain for three traits (average daily gain (ADG), weight of valuable cuts in half-carcass (VC) and number of piglets born alive (NBA)) in the aggregate genotype (AG) of pig breeds used in a three-way crossing system and total return from one round of selection within an 8-year investment period were calculated for five aggregate genotypes (AG). The AG differed in the relative weighing of the traits. For AG 1, true economic weights were used, they were calculated as the product of marginal economic values and the number of discounted expressions (NDE) for each trait and each selection group in all breeds; in AG 2, the differences in NDE between the selection groups within breeds were neglected; in AG 3 and AG 4, the differences in NDE between dam breeds were omitted using the weights of breed A or B, respectively; marginal economic values were used for all breeds in AG 5. The differences in total return between the alternatives were small (maximally 2.5 %). But compared with "true" weighing in AG 1, there were substantial losses (up to 25 %) in genetic gain for ADG in dam breed B (using AG 3), for NBA in dam breed A (using AG 4) and for NBA in both dam breeds (AG 5).
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