Journal of Animal Breeding and Genetics · 2015 · 14 citations · 16 references
Life SciencesAnimal SciencesGeneticsGenomic SelectionQuantitative GeneticsStatistical GeneticsBreeding ValueGenetic ImprovementGenetic Improvement Of LivestockGenetic ParametersGenetic Variance ComponentsHeritabilityAnimal Breeding ValuesGenetic Heterogeneity AnalysisGenetic Variance AnalysisHeteroscedasticity ModelingLitter Size GeneticsLitter Size ManagementQuantitative Genetic ImprovementQuantitative Trait Heritability
The genetic improvement in pig litter size has been substantial. The number of teats on the sow must thus increase as well to meet the needs of the piglets, because each piglet needs access to its own teat. We applied a genetic heterogeneity model to teat counts in pigs, and estimated a medium heritability for teat counts (0.35), but found a low heritability for residual variance (0.06), indicating that selection for reduced residual variance might have a limited effect. A numerically positive correlation (0.8) was estimated between the breeding values for the mean and the residual variance. However, because of the low heritability of the residual variance, the residual variance will probably increase very slowly with the mean.
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