Search

Linkage and QTL maps of Sus scrofa chromosome 11 (SSC11) have been produced based on four microsatellite markers genotyped in three F2 families from Wild Boar (W), Meishan (M) and Pietrain (P) crosses. The maps were similar across the families and in agreement with already published maps. Quantitative Trait Loci (QTLs) were identified in the W x M family and not in the M × P and W × P families. The QTLs affected live weight, loin and neck meat weight, back-fat depth and food consumption, and explained up to 4.7% of the F2 phenotypic variance. Additive and dominance effects were similar in size. The Wild Boar QTL alleles led to higher trait values in comparison with Meishan alleles. [ABSTRACT FROM AUTHOR]

Linkage maps of Sus scrofa chromosome 8 (SSC8) were constructed using seven markers in three F2 families based on Meishan (M), Pietrain (P) and Wild Boar (W) crosses. The maps were similar for the pedigrees and in agreement with published maps. Most quantitative trait loci (QTLs) were found for the W × P family, while only minor QTLs were detected in the M × P and W × M families. SSC8 harbours QTLs mapped in the interval SW905 to SW933 explaining up to 6% of the F2 phenotypic variance for body conformation, carcass and growth traits. Pietrain alleles positively influenced carcass traits, with additive effects often larger than dominance effects. For food conversion ratio a large dominance QTL effect was observed in the M × P family. [ABSTRACT FROM AUTHOR]

Linkage and QTL maps of Sus scrofa chromosome 17 (SSC17) were analysed with five markers and in three F2 families basedon Wild Boar (W), Meishan (M) and Pietrain (P) crosses. The maps were similar across the three families and agree well with published maps. In the M × P family, new quantitative trait loci (QTLs) for growth and fat deposition were locatedin the vicinity of GHRH, whereas in the W × P family one minor QTLs for daily gain was detected. No QTL was found in the W x M family. [ABSTRACT FROM AUTHOR]

The Sus scrofa chromosome X (SSCX) linkage and QTL maps, based on 11 markers, were investigated in F2 families generated from Wild Boar (W), Meishan (M) and Pietrain (P) crosses. The linkage maps were similar for the three families and to the published USDA-MARC.2 linkage map. Strongly supported quantitative trait loci (QTLs) for growth, fattening, meat quality and weight of head were mapped in the proximal part of SSCX of the M × P and W × P families, whilst QTLs for fat deposition andmuscling mainly were assigned to the mid part of SSCX in the W × M and M × P families. The QTLs explained up to 13.7% of F2 phenotypic variance. Meishan QTL alleles led to increased fatness traits, while those of Pietrain tended to increased carcass and meat weights and to decreased meat quality. [ABSTRACT FROM AUTHOR]

The Sus scrofa chromosome 15 (SSC15) linkage maps were produced with six markers in three F2 families based on Wild Boar (W), Meishan (M) and Pietrain (P) crosses. The maps were similar for the different families, with a higher rate of maternal recombination than paternal only in the M x P family. Quantitative trait loci (QTLs) for carcass composition (dressing yield, lean cuts and fat depth) explained up to 9% of F2 phenotypic variance in the W × P family and mapped near the marker S0148 (0 cM). Similar QTLs for fat depth were observed in the W × M family, where a minor QTL for dressing yield was mapped in the interval EAG-SW964 (approximately at 25 cM). No SSC15 QTL was found in the M × P family. [ABSTRACT FROM AUTHOR]

The SSC12 (Sus scrofa chromosome 12) linkage and QTL maps were generated using 11 markers, of which seven to 10 have been used in the three F2 families based on Wild Boar (W), Meishan (M) and Pietrain (P) crosses. Linkage maps showed identical marker order among the families, but differed in total lengths. They were in agreement with the already published maps, except for the order SWR1021SW605. Most quantitative trait loci (QTLs) affected fat or meat content in carcass, but were also found for some other traits (heart weight, CK20 values and teat number). They explained up to 5.4% of F2 phenotypic variance. Meishan alleles had stimulating effects on fat deposition and decreasing effects on lean content and CK20 value. The QTL profiles differed between families, with QTL effects in the vicinity of the GH1 locus found solely in the M x P family. [ABSTRACT FROM AUTHOR]

Linkage and QTL maps of Sus scrofa chromosome 9 (SSC9) were constructed using 16 markers, with 13 to 15 used in three F2 families based on Wild Boar (W), Meishan (M) and Pietrain (P) crosses. The LPR and SLN loci were integrated into the linkage map of SSC9 for the first time. Only a few quantitative trait loci (QTLs), explaining up to 5.1% of the F2 phenotypic variance, were identified on SSC9 with chromosome-wide significant effects on growth and fattening in the W x P family and on weight of liver, growth and fat-to-meat ratio in the W x M family. No QTLs were found in the M x P family. Gene effects were mainly dominant in the W x P family. In the W × M family, Wild Boar QTL alleles for weight of liver were superior over Meishan alleles. [ABSTRACT FROM AUTHOR]

Linkage maps of Sus scrofa chromosome 7 (SSC7) for three informative F2 families, based on Wild Boar (W), Meishan (M) and Pietrain (P) crosses, were constructed using 16 marker loci. Maps were consistent for the families, except the order of the markers PI2-PO1A-S0212 in the W × M family which was inverted in the M x P and W x P families. Important quantitative trait loci (QTLs) were localized in the region of the SLA complex in the M x P and W × M families. These explained up to 16% of F2 phenotypic variance for body conformation, fat deposition and muscling. In the W × P family, minor QTLs were mapped outside the SLA region. The highly significant QTL alleles were mainly additive (a > d). The Meishan alleles for QTL located in the SLA region were associated with higher head weights and carcass lengths, but with lower carcass fat contents than those from Wild Boar and Pietrain. The cryptic Meishan QTL allele, which reduces carcass fat, provides one of the first examples of transgressive segregation in animals and emphasizes that usefulgenetic variation can be hidden in the genetic background of a breed. [ABSTRACT FROM AUTHOR]