Bioscientifica Proceedings

Recent publication of the sequence of the pig genome allows for faster and more accurate selection for traits expressed late in life, sex limited or difficult to measure. Especially reproduction and adaptation traits fall in this category. Existing genetic variation in reproduction traits is substantial and polygenic selection has resulted in genetic trend of around half a piglet per sow per year. A very significant increase in genetic trend is anticipated through genomic selection. Genomic selection capitalizes mainly on Mendelian sampling, variation between full sibs is half of the total genetic variation; estimation of genetic merit based on markers yields, because of quantification of this Mendelian sampling, far higher accuracies then on the basis of parental average. For both polygenic and genomic selection, application appears to follow theory. Current research focuses of application of full sequence per animal, on non-additive genetic effects, and on genomic testing of embryos in order to increase selection intensity. Gradually traits relating to genotype-environment interactions will be added to the selection index, using genomic based methods.

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