Abstract
ABSTRACT Traits associated with meat performance are characterized by a complex inheritance model, including the effects of non-allelic interactions. The aim of this study was to estimate the significance of non-allelic interactions between pairs of loci in each of two alternative groups based on four important performance traits of ducks: body weight (BW), carcass yield calculated as the ratio of carcass weight to body weight (CY), breast and leg muscle yield as a fraction of carcass weight (BL-CW), and skin weight and abdominal fat, again as a fraction of carcass weight (SF-CW). The experimental material was based on an F2 cross between two parental lines: A-55 (Polish Peking) and GL-30 (French Peking). In total, 368 individuals were recorded. All of the birds (including parents and F1) were genotyped for 23 polymorphic microsatellite loci. Entropy was taken as a measure of interaction between pairs of loci, and the chi-square test was used to verify significance. In total, 253 pairs of loci were analyzed in both categories of each of the four traits. Statistically significant interactions were obtained for each trait. However, it was observed that some of the loci showed a greater tendency to have significant opposite interactions for alternative categories of the same trait. The results indicate the dependence of the recombination rate within pairs of loci on the level of each of the four traits.
Highlights
Some performance traits of poultry of importance to both consumers and breeders can be classified as binary
There are a number of reports on association studies of additive genetic effects of molecular markers with continuous animal performance traits
A considerable upward trend in duck meat production has been recorded in some European countries
Summary
Some performance traits of poultry of importance to both consumers and breeders can be classified as binary (for instance, satisfactory and not satisfactory). There are a number of reports on association studies of additive genetic effects of molecular markers with continuous animal performance traits It is well known that the genetic backgrounds of some traits are complex, including additive and non-additive effects between alleles vs loci. Classical estimation of non-additive genetic effects (based on mixed model methodology) requires a very large data set with favorable pedigree structure, family size, many highly polymorphic loci, etc. Pekin duck is becoming an increasingly popular poultry species among breeders in Asian countries, and in Europe. The trend corresponds with an increasingly diversified poultry meat market (Magdelaine et al, 2008)
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