Opportunities for genome-wide selection for pig breeding in developing countries.

Area of Science:

• Animal Genetics
• Quantitative Genetics
• Genomic Selection

Background:

• Traditional pig breeding in tropical developing countries faces challenges due to limited data recording infrastructure.
• Genome-wide selection (GS) presents a potential solution for accelerating genetic gain without requiring detailed pedigree systems.

Purpose of the Study:

• To evaluate the effectiveness of genome-wide selection (GS) in tropical pig populations, considering factors like linkage disequilibrium (LD) and heritability.
• To compare GS with traditional selection methods (BLUP, phenotypic selection) in simulations.

Main Methods:

• A simulation case study using a 60,000 SNP panel for the porcine genome.
• Exploration of various selection methods, trait heritabilities, and breeding programs under GS.
• Genomic predictions were performed using the ridge regression method.

Main Results:

• Genome-wide selection (GS) demonstrated superior performance over BLUP and phenotypic selection, leading to increased genetic gain and preserved genetic variation.
• GS effectively lowered inbreeding rates, particularly for traits with low heritability.
• Indigenous pig populations with low LD can benefit from GS with high-density marker panels.

Conclusions:

• Genome-wide selection (GS) is a promising tool for genetic improvement in tropical pig populations, even those with low linkage disequilibrium.
• Combining GS with crossbreeding strategies can rapidly enhance the genetic merit of commercial pig populations in developing countries.
• Further validation through application on real populations is recommended.