An approach for predicting heterosis based on an additive, dominance and additive x additive model with environment interaction

Article Abstract:

A method of predicting potential heterosis of offspring of crop hybridization by an additive, dominance and additive x additive model (ADAA) has been proposed. Using unbiased predictors of all three effects, formulae for predicting heterosis over midparent and heterosis over the better parent have been derived for differing generations. A formula for predicting the number of generations of a cross that would keep a certain level of heterosis over the better parent exists. Data from a diallele cotton cross are analyzed as an example. Formulae are given for predicting interaction heterosis with influence of the environment, or genotype by environment interaction.

China, Methods, Usage, Mathematical models, Biological models, Cotton (Fiber), Cotton

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Confirmed quantitative trait loci for fatness and growth on pig chromosome 4

Article Abstract:

One or more quantitative trait loci (QTLs) for growth and fatness have been confirmed on pig chromosome 4. Results from the recombinant sire family made it possible to map the major QTL effect distal to the recombination breakpoint. The confirmed QTL with a major effect on fatness should be designated FAT1 (ital). QTLs that are important for growth and fatness have been identified on pig chromosome 4 in the past in an intercross between Large White domestic pigs and European wild pigs. Two sows that were heterozygous for the chromosome region itself were backcrossed to a Large White boar. Two backcross boars were then backcrossed to Large White/Landrace sows.

Sweden, Chromosome mapping, Fat, Fats, Feral swine

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Heterosis and epistasis for teat number and fluctuating asymmetry in crosses between Jiaxing and Iberian pigs

Article Abstract:

The heterosis and recombination effects in a crossing experiment involving two distinct European and Asian breeds (Iberian and Jiaxing) and two successive backcrosses to the Iberian line are evaluated. Teat number (TN) in pigs is a discontinuous and often canalised trait presenting bilateral symmetry and this trait helps in evaluating fluctuating asymmetry (FA) and developmental instability.

Europe, Science & research, Hogs, Hog and Pig Farming, Analysis, Swine breeding

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