The Polymorphisms Of Ten Functional Genes And Their Correlation To Production Performance Of Suhuai Pigs

Polymorphisms of 10 candidate genes in 83 heads of the 4th generation Suhuai pigswere studied in this paper. Differences of genotypes of these genes among the pigs weredetected in early growth traits, carass traits and reproductive performance. The purpose wasto improve the Suhuai pigs breeding.Polymorphisms of 9 of the 10 candidate genes, except SCD gene were found fromthese pigs. There existed two genotypes of FUT1, IGF2, RYR1 and FSHβgenes. There wasno recessive homozygous rm genotype of RYR1 gene in these pigs. There were threegenotypes of the other five genes IGF1, MC4R, H-FABP, HSL and ESR gene from thesepigs.The correlation analysis showed that, neither IGF1 nor MC4R gene had significianteffect on early growth traits of the Shuai pigs. Average body weight at 20th day- old of thepigs with AG genotype of FUT1 gene was 5.25±0.73kg, significantly higher than that ofthose with GG genotype (P=0.006). Average weaning weight of the pigs with AG genotypeof FUT1 gene was 9.67±0.73kg, significantly higher than that of those with GG genotype(P=0.014). Average body weight at 20th day- old of the pigs with different genotypes ofRYR1 gene had significant difference (P=0.014), those with Nn genotype were significantlyhigher than those with NN genotype.There was no significant effect of polymorphisms of IGF1, MC4R, IGF2, FUT1 orRYR1 gene on the Suhuai pigs' carass traits. Backfat thickness of the Suhuai pigs with HHgenotype of H-FABP, HinfⅠrestriction sites was 19.18±0.27 mm, significantly lower thanthat of those with hh genotype (20.16±0.60 mm) (P=0.002); Backfat thickness of thosewith Hh genotype was 19.86±0.20mm, significantly lower than that of those with hhgenotype(P=0.018). Lean meat ratio of the pigs with HH genotype was 59.69±3.72％,significantly higher than that of those with hh genotype (54.84±8.02％) (P=0.003). Leanmeat percentage of the pigs with Hh genotype was 58.69±3.66％, significantly higher than that of those with hh genotype (P=0.035). H-FABP HaeⅢrestriction sites and MspⅠhadno significant effect on carcass traits of thses pigs. Backfat thickness of the pigs with GGgenotype of HSL gene was 19.79±0.11 mm, significantly lower than that of those with AAgenotype (20.23±0.68mm) (P=0.001). Backfat thickness of the pigs with AG genotype was19.88±0.32mm, significantly lower than that of those with AA genotype (P=0.011). Leanmeat percentage of the pigs with GG genotype of HSL gene was 59.89±1.99％,significantly higher than that of those with AA genotype (54.04±8.80％) (P=0.003). Leanmeat percentage of the pigs with AG genotype was 58.52±4.86％, significantly higher thanthat of those with AA genotype (P=0.024).Different genotypes of RYR1 gene had significant effect on average birth weight (P=0.042), and tended to have significant effect on litter weight at birth P=0.060), the pigswith Nn genotype were heavier than that of those with NN genotype. FSHβgene hadsignificant effect on litter size and alive litter size. Litter size of the pigs with AB genotypewas 12.13±2.01 piglets, significantly more than that of those with BB genotype(11.00±2.11 piglets) (P=0.020). Alive litter size of of the pigs with AB genotype was10.94±2.39 piglets, significantly more than that of those with BB genotype (9.78±2.37piglets) (P=0.037). FUT1 or ESR gene had no significant effect on reproductiveperformance of the Suhuai pigs.