Ocenjevanje parametrov križanja za velikost gnezda pri prašičih

Betka LOGAR; Milena KOVAČ

doi:10.14720/aas.2001.78.1.15586

Authors

Betka LOGAR Univ. of Ljubljana, Biotechnical Fac., Zootechnical Dept., Groblje 3, SI-1230 Domžale and present address: Agricultural Institute of Slovenia, Hacquetova 17, SI-1001 Ljubljana, Slovenia
Milena KOVAČ Univ. of Ljubljana, Biotechnical Fac., Zootechnical Dept., Groblje 3, SI-1230 Domžale, Slovenia

DOI:

https://doi.org/10.14720/aas.2001.78.1.15586

Keywords:

pigs, reproduction, litter size, crossbreeding parameters, animal model

Abstract

In the research 46 960 parities of Swedish Landrace (SL), Large White (LW), and both F1 sows, line 12 (SL x LW) and line 21 (LW x SL) were included. With repeatability animal model the number of piglets born (PB) and the number of piglets born alive (PBA) in the first six litters were analyzed. The differences between genotypes were estimated by crossbreeding parameters. Mathernal components were studied: additive maternal and additive grandmaternal effect as well a maternal heterosis, all treated as independent variables. The contribution of additive maternal effect to the breed differences (SL-LW) was larger for PBA (0.36) than for PB (0.09). The estimated deviation of the F1 crossbreeds from the mid parental value (maternal heterosis effect) was 0.69 and 0.72, for PB and PBA, respectively. The additive grandmaternal effect which expresses the differences between crossbreeds (SL x LW-LW x SL) is negligible (0.06 for PB and –0.03 for PBA).