Genetische Beziehungen für das Merkmal Lebenstagszunahme in einem Dreirassenkreuzungsprogramm beim Schwein

Abstract

Abstract. Title of the paper: Genetic association for daily gain (lifetime) in an crossbreeding program The aim of this investigation is an analysis of the crossing structure of a three-race crossing program and the genetic relations with respect to the trait average daily gain. For this purpose we examine the genetic relations for their usefulness for a estimation of genetic parameters and breeding values. Finally a parameter estimation is carried out. The data basis consists of 1757 German Large White performances, 34980 Landrace performances and 2775 Pietrain performances in pure breed as well as 92757 performances of the crossings of the mother lines and altogether 13854 Pietrain crossings (1997 PI x DL and 11857 PI x DEDL). The heritabilities for the variable daily gain are in the range from 0.17 to 0.31. The genetic correlations between the mother races and their crossbreedings are around 0.9. Between the pure Pietrain and the Pietrain crossings these values reach only 0.7. Within the two groups of crossings with Pietrains the genetic correlations are almost one. From the genetic point of view it is possible to put together the mother races and their crossings as well as the Pietrain crossings. Thus, for this trait it is sufficient to consider a three variable model with separate investigation of the mother races, the Pietrains and the Pietrain crossings.

Genetic parameters of direct and ratio traits from field and station tests of pigs

“…These findings suggest that though meat quality is internationally considered an important trait to be improved by genetic selection its definition may not be optimal. Valuable cuts and proportion of valuable cuts both showed moderately high heritabilities and were in accordance with the reported estimates of others (GROENEVELD et al, 1998;GROENEVELD and PESCOVICOVA, 1999;WOLF et al, 2001;SCHULZE et al, 2001;FISCHER et al, 2002). The other traits measured in the station test (DOT, FEED, NDG, FCR) showed moderate heritabilities and were similar to the findings of CHEN et al 2002; DUCOS et al (1992); ZHANG et al 2000for DOT;GROENEVELD et al (1996) for FEED; but were higher than reported by HERMESCH et al 2000, HOFER et al, (1992) and MRODE and KENNEDY (1993) for NDG, FCR.…”