Selection response for Large White pigs after introducing animal model in the genetic evaluation of pigs
2004
Peskovicova, D.,Vyskumny ustav zivocisnej vyroby, Nitra (Slovak Republic) | Hanusova, E.,Vyskumny ustav zivocisnej vyroby, Nitra (Slovak Republic) | Bobcek, B.,Slovenska polnohospodarska univ. v Nitre (Slovak Republic)
The data from pig performance testing and genetic evaluation of the Large White breed in Slovak pig breeding program were used to analyze genetic improvement from 1993 to 2003. The 7-trait animal model implemented in routine genetic evaluation in Slovakia since January 2000 was used to estimate the breeding values of animals. Genetic trends for the following traits included in the total breeding value (aggregate genotype) were analyzed: average daily gain in field test, percentage of valuable cuts measured in station test, number of piglets born alive in the 2nd and later litters. Genetic trends were estimated as the average breeding values across the years of birth separately for performance tested males and females. Continuous genetic improvement for all traits under study was observed since 1993. The highest genetic improvement was found in valuable cuts content with cumulative genetic gain 2.58 percent and 2.28 percent for tested male and female population, respectively. Higher genetic improvement and differentiation of genetic level for male and female population was estimated for animals born since 1998 especially for traits with lower heritability (number of piglets born alive in 2nd and later litters). For this trait, cumulative genetic improvement from 1993 to 1997 was very small (+0.09 and +0.08 piglet per litter for male and female population, respectively), while significantly higher genetic gain since 1997 was determined (0.38 and 0.25 piglets per litter). These findings support the assumption of positive influence of introducing BLUP and animal model in the routine genetic evaluation. The analysis of active population of boars in May 2003 is also given. Genetic improvement in other pig populations is discussed in the article.
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