Selection in the nucleus of the Federal Hybrid Crossbreeding Scheme (BHZP) and the traditional herdbook system has been compared for the years 1980 to 1985. In the herdbook some 136,000 performance records on auction boars were available with the traits daily gain (DG), ultrasonic backfat (BF), sib index (SI) and a selection index (INDEX). In the BHZP nearly 20,000 performance records on on farm’ tested gilts and station tested boars were analysed. Traits are DG, BF and feed conversion efficiency (FCE) for boars. Parameters analysed are: selection differentials at time of selection, annual selection differentials (ASD) in the offspring group and cumulative selection differentials (CSD). Expected monetary gains were calculated. ASD's were in the same order of magnitude for both systems, between .57 and .91 standard units for the index in the herdbook and .69 and .97 for the BHZP respectively with expected monetary gains per annum of 2.77 DM and 3.96 DM for the herdbook and 5.31 DM and 7.47 DM for the BHZP, respectively. CSD does not seem to be a suitable parameter on the herdbook situation with a high proportion of immigration. In the BHZP the values for expected monetary gain ranged from 11.72 DM to 22.42 DM for the total population. Since no data are available on sow replacement in the herdbook the overall annual expected gain for the best society was estimated at some 2 DM, while the best line in the BHZP produces a gain of around 6 DM.

Eildert Groeneveld, E. Werhahn

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume X. Breeding programs for swine, poultry, and fish., , 110–118, 1986
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