[No authors listed]
To select new Large White line with high number of piglets born, genotypes of estrogen receptor (ESR), the follicle stimulating hormone β subunit (FSHβ), catenin alpha like 1 (CTNNAL1) and miR-27a were tested in 472 Large White sows. The associations of different genotypes with litter size traits were also studied. The results showed ESRBB and FSHβBB sows produced 0.41-1.49 more pigs per litter (pâ<â.05) for total number born (TNB) and number born alive (NBA) than did other corresponding genotypes. TNB of CTNNAL1CG sows is 0.50 more pigs per litter (pâ<â.05) than that of CTNNAL1GG sows with the dominance effect of 0.25 pigs per litter (pâ<â.05). miR-27aBB sows had a less estimated breeding value (EBV) to TNB and had a more number of mummified pigs (NM) than did miR-27aAA or miR-27aAB sows (pâ<â.05). Therefore, ESRB, FSHβB, CTNNAL1G, miR-27aA allele was favorable for litter size traits. Furthermore, combined genetic effect analysis showed ESRAAFSHβBB, ESRAACTNNAL1CG, ESRAAmiR-27aAA, FSHβBBCTNNAL1CC, FSHβBBmiR-27aAA and CTNNAL1CG miR-27aAB was the favorable combined genotype for litter size traits. These results identified favorable alleles and genotypes for litter size traits and suggested a potential selection scheme for litter size in Large White pigs.
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